434 Annals Entomological Society of America [Vol. VI, 



by a short vein, the costa connectens (ca-c). From the union 

 of the costa primaria and costa connectens the costa apicaHs 

 (ca-a) extends outward toward the apex of the wing. Behind 

 the costa apicaHs and nearly parallel with it lies an unnamed 

 vein which is usually unbranched although in an abnormal 

 specimen a short branch vein has been noticed arising from it 

 and extending outward between it and the costa apicalis. 

 From the union of the costa subtensa and the costa connectens 

 extends the costa decurrens (ca-d), a strongly curved vein. 

 Behind the costa decurrens lie two nearly straight, short veins 

 called the costa lineatas (ca-1). Behind the costa lineatee lie 

 three veins in the anal area, the costa radiantes (ca-r). The 

 first is not attached to the base of the wing while the second and 

 third are so attached. 



A bdomen 



The abdomen is broadly joined to the thorax and its anterior 

 portion is overlapped by the metathorax to such an extent that 

 the spiracle situated in the pleural region of the first abdominal 

 segment is completely hidden beneath the metapleuron. The 

 first six segments of both male and female bear a pair of spira- 

 cles. 



The first four and part of the fifth segments of the abdomen 

 show clearly the marking off into four typical regions. The 

 notum (no) is the flat, black, dorsal portion on which the wings 

 rest. The pleural areas or connexivum which form the sides of 

 the trough in which the wings lie when at rest are situated one 

 on either side of the dorsal region, and extend to the prominent 

 lateral edges of the abdomen. The sternal area is that forming 

 the ventral and lateral portions of the abdomen. The spiracles 

 (sp) are located near the dorsal edges of the sternum. The 

 sclerites of the posterior portion of the fifth segment, and of the 

 segments following, are more or less closely fused together and 

 are specialized for reproduction in both males and females. 



There are nine segments in the abdomen of the male. The 

 seventh is not visible under normal conditions, but together 

 with a large part of the eighth segment, is retracted within 

 the sixth segment. The seventh segment is highly specialized 

 for this purpose, being merely a collar of chitin which telescopes 

 over the base of the eighth segment. The eighth or genital 

 segment is also highly specialized, its sclerites being solidly 



