168 NEDROPTERA OF NORTH AMERICA. 



before the apex, black, subpruinose, segments 2 — t each side with 

 a larger yellowish spot, which is obsolete in the female ; append- 

 ages black ; anterior lamina entire ; hamules prominent, black, 

 furcated, the external branch large, truncated ; vulvar lamina 

 large, erect, triangular, excavated ; wings hyaline ; pterostigma 

 oblong, fuscous; membranule black; 7- — 10 autecubitals ; 6 — T 

 postcubitals ; two discoidal areolets. 



Length 30 millim. Alar expanse 48 millim. Pterostigma 2^ 

 millim. 



Hah. Cuba (Poey). 



13. D. debilis ! 



Di/themis debilis Hageu ! 



Nigro-fuscous ; mouth and front yellowish-white ; vertex, and 

 the front above, chalybeous ; thorax nigi-o-fuscoue, clothed with 

 cinereons hair, pruinose; the sides brassy-fuscous, obsoletely spot- 

 ted with yellow; feet black, anterior femora pale beneath; abdo- 

 men shorter than the wings, slender, somewhat broader before the 

 apex, triquetral, black, the base pruinose, the seventh segment 

 each side with a lateral spot, which is long, triangular, segments 

 5 — 6 each side with a lateral line, yellowish ; appendages black ; 

 anterior genital lamina each side with an impressed, flat, pyriform 

 lobe; hamule not prominent; wings hyaline; pterostigma oblong, 

 fuscous ; membranule blackish-gray. Adult male. 



Six antecubitals ; four postcubitals ; two discoidal areolets. 



Length 24 millim. Alar expanse 37 millim. Pterostigma 2 

 millim. 



Bab. Cuba (Poey). 



ERYTHEMIS Hagen. 



Eyes connected in a short space ; posterior lobe of the pro- 

 thorax large, broad, bilobed ; abdomen a little shorter than the 

 wings, broad, depressed, the apex sensi1)ly narrower ; feet long, 

 rather strong; first sector of the triangle a little sinuated; triangle 

 moderate, narrow; caudal appendages short; genital organs hardly 

 prominent ; vulva disclosed or obtected, the segment following it 

 a little carinated, bituberculated ; sides of the eighth abdominal 

 segment of the female not dilated. 



