426 



PROCEEDINGS OF THE ACADEMY OF 



[June, 



A paratypic series of three males and sixteen females of this species 

 have been examined. There is a slight difference in the size of some 

 female individuals, several being slightly larger than the type. A ten- 

 dency to the elimination of blackish marks on the abdomen is noticed 

 in some female individuals, and in one the abdomen is about unicol- 

 orous. 



Dellia bimaculata 



Types: cJ" and 9 ; Carrillo, Costa Rica. [Hebard collection.] 

 Differing from D. miniatula in the form of the male cerci, the less 

 recurved apex of the male abdomen and the striking coloration. 



Size about equal to that of D. miniatula in the female sex, slightly 

 larger in the male; form similar to that of D. miniatula; surface slightly 

 rugulose, rather uniformly clothed with moderately long hairs, espe- 

 cially on the limbs. Head with the occiput rounded and sloping toward 



Fig. 26. — Dellia himaculafa. Lateral view of male type. 



the fastigium; interocular space very narrow, in the male the eyes are 

 subcontiguous ; fastigium short, about as broad as long, distinctly but 

 narrowly sulcate in both sexes, forming a distinct but narrowly 

 rounded angle with the front, ventral aspect of fastigium slightly 

 concave and passing insensibly into the face a very slight dis- 

 tance ventrad of the antennal iasertions; eyes ovate and very promi- 

 nent in the male, considerably elevated above the vertex and almost 

 twice as long as the infra-ocular portion of the gense, subreniform in the 

 female, very slightly elevated above the vertex and slightly more than 

 half again the infra-ocular length of the gense; antennae filiform, slightly 

 .shorter than the body in the male, considerably shorter in the female. 



