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Enzyme polymorphism was investigated by means of horizontal starch gel electrophoresis in samples of 8 populations of Glossina pallidipes Austen in Kenya. Polymorphism was demonstrated in 3 of the 11 enzyme systems studied: non‐specific esterases, aldehyde oxidase, and leucine aminopeptidase. The amount of genetic variation was low for all samples. The results are discussed in connection with the geographical distribution of the populations studied. It is concluded that the significance of the zymogram technique as used in this study, is limited for the characterization of populations of G. pallidipes. ZUSAMMENFASSUNG Enzympolymorphismus in Populationen der Tsetsefliege Glossina pallidipes Austen in Kenya Enzympolymorphismus wurde in Proben von 8 Populationen von Glossina pallidipes aus Kenya mit Hilfe horizontaler Stärkegelelektrophorese untersucht. Polymorphismus wurde in 3 der 11 untersuchten Enzymsysteme nachgewiesen: Nicht‐spezifische Esterase, Aldehydoxydase und Leucin‐Aminopeptidase. Der Umfang der genetischen Variation war in allen Proben gering. Die Resultate werden diskutiert in Zusammenhang mit der geographischen Verteilung der untersuchten Populationen. Offenbar ist die Bedeutung der Zymogrammtechnik. wie sie in dieser Untersuchung verwendet wurde, zur Charakterisierung von Populationen von G. pallidipes begrenzt.

Comparisons were made in the field and in the laboratory of the diurnal activity patterns of Glossina pallidipes Austen in Kenya; Nkruman and Mwalewa. In the field, different diurnal activity patterns were found. Flies from Nkruman showed a late afternoon peak, especially for males, while flies from Mwalewa had a major activity peak in the morning, a smaller afternoon peak, and a clear midday depression. The activity of d d from both areas was positively correlated with temperature in the early morning and in the late afternoon. In the early afternoon, the activity of d c~ from Mwalewa was negatively correlated with temperature, while for Nkruman d 8 no correlation was found. Males from Mwalewa show the highest activity around 30*, while the highest activity for d d from Nkruman is found at around 34---36 °.Laboratory studies showed that the total daily activity of d ~ from both areas increased with increasing hunger. At 24* the spontaneous activity pattern of d d from Nkruman showed a progressive increase in activity throughout the day, while that of d c~ from Mwalewa showed a midday peak.The results of the laboratory study on the spontaneous activity pattern help to understand the activity patterns observed in the field. The differences in spontaneous activity patterns, survival in relation to temperature, and the effect of temperature and hunger on these patterns, seem to be under genetic control. KEY WORDS: Glossina pallidipes ~ Diurnal activity pattern m Spontaneous activity patternAllopatric populations --Endogenous pattern --Population diversity.

Comparative studies on the relative efficiency of two types of trap, commonly used for catching Giossina pallidipes Austin, the Langridge Box Screen (LBS) and the Awning Screen Skirt(ASS), were carried out for two allopatric populations of this species in Kenya. The relative efficiency of the two traps is different in the two populations. The ASS is more efficient than the LBS in collecting flics of one population, but not of the other. The test of independence indicates that the sex ratio in the catches is independent of the type of trap, but dependent on the population. The results indicate that the ASS is preferable to the LBS for sampling G. pallidipes. It is concluded that the difference in efficiency is related to behavioral differences between the flies of the two populations. RÉSUMÉ COMPARAISON DE L'EFFICACITÉ DE DEUX TYPES DE PIÈGES SUR DEUX POPULATIONS ***ALLOPATRIQUES DE GLOSSINA PALLIDIPES AU KENYA Deux types de pièges, utilisés fréquemment pour capturer Glossina pallidipes, — le “Langndge Box Screen” (LBS) et le “Awning Screen Skirt” (ASS) — ont été comparés sur deux populations allopatriques au Kenya. Deux pièges de chaque type ont été utilisés, soit quatre pièges dans chaque zone. L‘étude des influences du site a été introduite. L'efficacité relative des deux types de pièges est différente pour les deux populations. ASS capture plus de Glossnia pallidipes que LBS dans une population, mais pas dans l'autre. Un test d'indépendance (G. test) montre que le taux sexuel est indépendant du type de piège, mais pas de la population. Dans chaque zone, des nombres significativement différents de mouches ont été capturées dans les quatre sites, mais il n'y avait que de faibles différences entre les taux sexuels et les taux de captures de LBS et ASS. Ces dernières ne peuvent cependant, expliquer les différences observées entre les deux zones. La densité de population et les méthodes de capture ne peuvent expliquer — par suite de l'influencc du site — les résultats différents des deux types de pièges entre les deux zones; on peut en conclure que les différences sont provoquées par des comportements différents des deux populations. ASS est le type de piège le plus efficace pour capturer Glossina pallidipes. Dans les deux zones, ASS capture le plus grand nombre de mouches, sans altération du taux sexuel, et présente le plus faible facteur de variation.