Vol. XXvii] ENTOMOLOGICAI, NEWS. 169 



Abdomen slender; i yellow, light brown above to level of the auri- 

 cles, except at the extreme base which is pale ; 2 similar, dorsal pale 

 brown narrower on anterior half of segment, extreme posterior border 

 brown on the sides as well as above; 3 brown, fading out anteriorly 

 into clear light yellow, especially on the sides which are nearly one- 

 half the lighter color, while on the dorsum the brown, grown very pale, 

 reaches the anterior border of the segment; 4-7 black, bright yellow at 

 base of each segment, where it is very narrowly divided by black in the 

 mid-dorsal line, this black line a narrowed continuation of the apical 

 black which occupies two-thirds to three-fourths of each segment; the 

 yellow and black encircle each segment ; 8-10 dull obscure brown with- 

 out definite markings, sides slightly paler, yellowish; 7 similarly paler 

 basally; 8-10 dark at extreme apex. Superior appendages pale dull 

 green, black beneath and basally; inferior black or dark brown. 



Stigma brown ; venation black. Femora brown, first pair greenish 

 beneath, all alike armed with numerous short equal spines ; tibiae and 

 tarsi black (right hind tibia and tarsus pale brown). First hamule and 

 horizontal shaft of second hamule very pale brown or flesh colored, 

 second hamule at the subapical elbow shading darker, becoming black 

 at the apex. The hamules are both remarkable, but the first probably 

 more so. It consists of a short cylindrical, truncated base, the inner 

 side of which is produced in a large, thin, shell- or leaf-like expanded 

 plate with its concave face directed outward, and its apex bilobed. 



Described from a single male in my collection, taken near 

 Wismar, British Guiana, January 31, 1912. Between Wismar 

 and Christianburg is a small stream flowing into the Demerara 

 River and crossed by the footpath between the two towms. In 

 the afternoon the backward flow of the river due to tides 

 makes this stream almost unwadable near its mouth. We were 

 attracted to this muddy, log-choked creek by the beautiful 

 Diastatops diinidiata which we found nowhere else. The 

 banks of the creek are generally covered with impenetrable 

 brush and the exposed margins are slippery and treacherous, 

 due to the rise and fall of water over them. xA.t places logs 

 are piled so indiscriminately in the creek that progress is slow 

 and difficult ; and at places the overhanging bushes completely 

 shade the stream. While working through one of the log piles 

 I flushed the only Cyanogomphus seen, which flew weakly to a 

 bush on the bank, alighting on a leaf at an elevation of 10 or 

 12 feet. The specimen is apparently young, though I believe 



