Vol. XXVlli] ENTOMOLOGICAL NEWS. 19 



to separate the two species by the markings on the palpi. As 

 shown in the foregoing table the difference between the mark- 

 ings of the palpi is in the arrangement of the black and white 

 bands. The white markings of A. albimanus can be plainly 

 seen with a small lens and they consist of a white tip, or apex, 

 and two narrow white bands. The white tip is separated 

 from the nearer white band by a wide black band more than 

 twice as wide as either the white band or tip. This nearer 

 white band is separated from the second white band by an- 

 other black band about as wide as the first black band. In 

 A. tarsimaculata the palpi have a wide white tip and one wide 

 white band and another narrower one. The wide white tip is 

 separated from the nearer wide white band by a narrow black 

 band less than half as wide as either the wide white band or 

 tip. This nearer wide white band is separated from the sec- 

 ond white band, which is a narrow one, by a wide black band 

 much wider than the wide white band. 



These two species seem to be very closely related to each 

 other and the only practical difference between them is in the 

 arrangement of the bands on the proboscis. Some specimens 

 when caught as adults may have the proboscis so badly rubbed 

 that they may be almost entirely denuded of scales. These are 

 very difficult to identify as it is the scales of different colors 

 that give the color markings on the proboscis, but the differ- 

 ence in fresh specimens can be so readily seen that a glance at 

 the proboscis is all that is required to separate the two species. 



All of the markings that I have described are so distinctive 

 and well-defined on fresh unrubbed females that they are ob- 

 vious to an untrained observer, and after they have been seen 

 a few times are easily remembered. The best plan for a be- 

 ginner is to acquire experience by identifying bred out speci- 

 mens before starting on those that have been caught in flight. 



This method of identification only pertains to the seven com- 

 mon species and does not provide for the classification of the 

 uncommon species or for any new species that may make their 

 appearance in the Canal Zone. These encounters are liable to 

 occur but seldom if at all. After a little experience one be- 

 comes so familiar with the markings of the common types that 

 any new varieties can easily be detected. 



