162 American Midland Naturalist Monograph No. 3 



L) broadly rounded, widely separated, bearing numerous scattered setae. Tenth 

 stern'ite (X-S) prominent, heavily sclerotized beyond middle. Phallosome (Ph) 

 bluntly conical, open ventrally, closed dorsally. Claspette (CI) with stem 

 slender, triangular expanded apically, the expanded portion weakly attached to 

 basistyle before middle, with a row of about five long slender filaments on 

 crown, generally directed dorsad. Basistyle (Bs) slightly more than twice as 

 long as broad, cylindrical, nearly truncate at apex, clothed with sparse scales 

 and numerous long setae; basal and apical lobes absent. Dististyle (Ds) reticu- 

 lated, about two-thirds as long as basistyle, narrow basally, expanded beyond 

 middle and broadest at apical third, then tapering to a slender curved tip, 

 terminating in a peg-like claw (Ds-C). 



LARVA. (Fig. 85). — Head broader than long. Antenna shorter than head, 

 spinose; antennal tuft multiple, inserted before middle of shaft, not reaching 

 tip. Head hairs: Preantennal (A) multiple, extending beyond insertion of 

 antennal tuft; lower (B) and upper (C) long, single; postclypeal (d) small, 

 branched; sutural (e), trans-sutural (f), and supraorbital usually double. 

 Comb of eighth segment of six scales; individual scale with apical spine about 

 twice as long as the stout subapical spines. Siphon somewhat inflated, about 

 three times as long as basal width; pecten of about six teeth on basal third of 

 siphon; subventral tuft small, usually 3-branched, inserted beyond middle of 

 siphon; hair of lateral valve minute, less than half as long as the apical width 

 of siphon. Anal segment longer than wide, completely ringed by the dorsal 

 plate; lateral hair small, multiple; dorsal brush consisting of a long lower 

 caudal hair and a shorter multiple upper caudal tuft on either side; ventral 

 brush extending almost the entire length of the anal segment; gills 4, longer 

 than the anal segment, pointed. 



DISTRIBUTION. — Florida Keys (52); Bahamas and West Indies. The 

 species was recorded from Key West, Florida, in 1901, but has not since been 

 found in the United States. 



BIONOMICS. — Dyar (54) states that the larva occur in temporary rain-filled 

 pools. 



PSOROPHORA (GrABHAMIA) SIGNIPENNIS (Coquillett) 



Taeniorh^nchus signipennis Coquillett, 1904, Proc. Ent. Soc. Wash., 6:167. 



ADULT FEMALE. — Medium sized species. Head: Proboscis dark scaled, 

 except for a very wide median whitish-yellow band (width of band about equal 

 to half the length of the proboscis); palpi short, dark, speckled with a few pale 

 scales. Occiput clothed dorsally with narrow golden-yellow scales and erect 

 forked scales; the forked scales of central region pale, others dark. Occiput 

 clothed laterally with a patch of broad flat yellowish scales; this pale-scaled 

 patch usually either speckled with dark scales or partially enclosing a small 

 dark-scaled area near eye margin. Thorax: Integument of scutum dark brown, 

 clothed with fine narrow pale-yellow to golden-brown scales. Abdomen: First 

 tergite white scaled; remaining tergites primarily white scaled, more or less 

 speckled or spotted with dark scales. Venter mostly pale scaled, speckled or 



