14 U.S. NATIONAL MUSEUM BULLETIN 283 



which is oblique to semierect and placed near middle of wing; anal 

 vein straight, not swollen in middle. 



Abdomen: Female spermathecae usually 3 (2 large and functional 

 and 1 rudimentary), rarely 1 spermatheca and never 3 functional. 

 Sclerotization of female genital opening with sternum IX bearing 

 strong hairs on its surface, with a wide but shallow cleft on caudal 

 margin; a pair of internal lamellae extending from side margins mesad 

 toward gonopore, their mesal ends nearly meeting and usually slightly 

 expanded with truncated or foot-shaped tip. Male genitalia with 

 sternum IX usually narrow with shallow caudomedian excavation, 

 the ventral membrane between it and aedeagal sclerites bearing fine 

 spiculation; tergum IX usually with long hairs, usually rounded 

 caudad with a pair of membranous, pubescent, or setigerous sub- 

 median lobes just ventrad of caudal margin; basistyle lightly to 

 moderately hairy, basal margin usually with distinct, characteristically 

 formed processes at one or both of two points, termed accordingly 

 mediangular process if arising near caudomesal angle, or basidorsal- 

 process if arising on dorsal margin near base of basistyle; a sclerotized 

 ribbon or distinct bridge, sometimes intensely sclerotized, often 

 present joining the 2 basis tyles either at the mediangular process or 

 the basidorsal process; dististyle often arcuate, incurved at middle or 

 beyond and usually tapering toward the distal end, which is fre- 

 quently bent slightly mesad; aedeagus membranous but with a pair 

 of oblique aedeagal sclerites (sometimes reduced to weak small 

 lappets) appearing as narrow rods, bisinuate or crooked plates with 

 slender ends, and often with distomedian point distinctly bent; a 

 submedian pair of usually lightly sclerotized platelike or rounded 

 submedian lobes usually present arising from dorsal side of aedeagal 

 sclerites; parameres usually well sclerotized, appearing as nearly 

 straight processes directed caudad with distal tips bent or curving 

 ventromesad; from their bases arise a pair of sclerotized apodemes, 

 frequently expanded at their mesal ends or with secondary processes, 

 which extend laterally to base of basistyle. 



Immature stages. — The immature stages of Stilobezzia are poorly 

 known. Carter, Ingram, and Macfie (1921) included a description 

 and figures of the pupa in their description of spirogyrae. Ingram and 

 Macfie (1922) described the immature stages of poikiloptera (Ingram 

 and Macfie) from West Africa. Thienemann (1928) published figures 

 of the pupa of the European gracilis (Haliday). Mayer (1934) added 

 descriptions of the pupa of soror Johannsen and the larva and pupa of 

 perspicua Johnannsen from the Dutch East Indies. Thomsen (1937) 

 described and figured the early stages of antennalis (Coquillett) and 

 bulla Thomsen from New York. Lane, Forattini, and Rabello (1955) 



