Vol. xxvii] 



ENTOMOLOGICAL NEWS. 



345 



Mallali, March n, 1913 (Parish); $, Roseau, Dominica, 

 British West Indies, June 22, 1911 (Lutz.) 



The Guiana material, represented only by females, was de- 

 termined as G. (L.) alexanderi Johnson in my paper on Brit- 

 ish Guiana Tipulidae (Trans. Am. Ent. Soc., vol. 40, p. 242, 

 1914) ; the Peruvian specimens were determined as probably 

 representing a new species closely allied to alexanderi (Trans. 

 Am. Ent. Soc., vol. 42, p. 17, 1916.) 



The two species, G. alexanderi Johnson (Nearctic) and G. 

 helophila sp. n. (Neotropical) are closely allied and may be 

 separated most readily by the structure of the male genitalia, 

 these differences being expressed as follows : 



Fig. 1. Wing of Gonomyia (Leiponeura) helophila sp. n. 

 Fig. 2. Wing of G. (L.) alexanderi Johnson. 



Fig. 3. Pleurite and appendages of the male hypogygium of G. (L.) helophila ; d, 

 dorsal appendage ; v, ventral appendage. Dorsal aspect. 

 Fig. 4. The same for G. (L.) alexanderi. 

 Fig. 5. Wing of Eriocera aetherea sp. n. 

 Fig. 6. Wing of Erioeera domingensis sp. n. 



Dorsal pleural appendage triangular, the caudal angle a prominent 

 spine that is heavily chitinized apically; middle pleural appendage 

 apparently lacking; ventral pleural appendage with a broad flattened 

 blade, the inner caudal margin with about five or six acute, chitin- 

 ized, appressed teeth of which the innermost is the largest (see figs. 

 2, 4). alexanderi Johnson 



