496 NEW YORK STATE MUSEUM 



Eucorethra underwoodi Undw. Genitalia, male. Basal clasp 

 segment very stout, broad, apex obliquely rounded. Terminal 

 segment stout, somewhat curved with a number of stout setae on its 

 basal portion, apical part slightly enlarged and bearing a short, 

 stout, articulate spine. Harpagones probably represented by 

 short, stout, distant, quadrangular processes. Unci long, slender, 

 largely retracted, apical portion irregularly convolute, quill-like,, 

 terminated in a somewhat acute tip. 



Corethrella brakeleyi Coq. Genitalia, male. Basal clasp segment 

 stout, slightly concave interiorly, broadly rounded exteriorly to a 

 somewhat narrow apex bearing long, strongly arcuate terminal 

 segments, the latter ending in an acute point but with no indication 

 of a terminal spine. Claspette apparently represented by a stout, 

 chitinous spine at the basal third of the large clasp segment. 

 Harpes approximate, long, slender, tapering gradually to a fine, 

 rounded apex. Harpagones, unci and setaceous lobes apparently 

 absent. [PI. 19, fig. 2] 



Female. Lobes composed of a smaller anterior segment and a 

 larger broadly rounded posterior one. Tergum broadly rounded 

 posteriorly, ventral plate tapering obliquely to a narrow truncate 

 inargin and with a stout seta at the posterior angles. 



Corethra cinctipes Coq. Genitalia, male. Basal clasp segment 

 stout, rounded exteriorly, anterior margin nearly straight, obliquely 

 truncate. Terminal segment rather stout, somewhat curved and 

 slightly enlarged apically; tip with a small, acute, articulate spine. 

 Harpes absent. Harpagones approximate, stout, with a slight 

 ventral and dorsal curve, terminating in a stout, decurved, bluntly 

 rounded point. 



Corethra lintneri Felt. Genitalia, male. Basal clasp segment 

 gently rounded exteriorly, with interior margin nearly straight, 

 apical portion obliquely rounded. Terminal segment rather stout, 

 somewhat curved and slightly enlarged apically, tip bearing a small 

 articulate spine. Harpes absent. Harpagones stout, somewhat 

 irregular, terminating in an acute, slightly recurved, chitinous spine. 



Female. Base of lobes sublateral, widely separated, expanding 

 posteriorly to an obliquely truncate apex. 



Corethra karnerensis Felt. Genitalia, male. Basal clasp segment 

 gently rounded exteriorly; interior margin slightly curved, apex 

 rather broadly rounded. Terminal segment rather stout, slightly 

 enlarged at both extremities and with a moderate, acute apical 

 spine. Harpes absent. Harpagones stout, somewhat irregular, 

 terminating in an acute, slightly recurved, chitinous spine. 



Female. Lobes almost approximate, very broad, scarcely longer 

 than wide and with numerous long, coarse setae. 



Corethra fuliginosus n. sp. Genitalia, male. Basa.1 clasp segment 

 stout, slender with a broadly rounded apex. Terminal clasp seg- 

 ment very long, slightly expanded at the base, more so distally and 

 with a rather stout, acute apical spine. Harpes apparently absent. 

 Harpagones short, stout, slightly recurved, broadly rounded 

 apically. Tergum obliquely truncate posteriorly. 



