118 NEW YORK STATE MUSEUM 



furnished (along with Ilio iisu:il daws) with a special finger-like 

 projection, extending over and between the claws, while a doubly 

 curved curious comb-like appendage faces it from below (pl.35, 

 fig.8) . 



AVings rudimentary (ligs.l and .~> i ; much smaller in the females 

 than in the males; wings without nervures. Halteres distinct 

 (fig.7). The convex eyes are distant in b<ih sexes luii farlherest 

 apart in the females. Both the claws on the end of the tarsi of 

 the male are deeply cleft or bifid (fig.8), those of the female 

 being simple. The comb-like appendages are similar in both 

 sexes. 



The external genitalia of the male consist of a powerful two- 

 jointed pair of forceps, the lower joints of which are large, 

 massive, subglobular. while the terminal joints are small and 

 linear, and s<> ;irl iculaii d to llie lirsi us In nine inwardly between 

 them when not in use. These lerminal joints of llie forceps carry 

 at their lips an armature of short, sharp, scattered, horny spines. 

 The ovipositor of the female is conical, narrowing towards the 

 acute apex : it is const it nted ..f i \\ o lateral plales or valves, which 

 cover and protect two very delicate, parallel, acute, membranous 

 spiculae. 



Mr Deby further gives an extended description of the species, 

 and a plate of eleven figures showing details of structure. The 

 figures of the wings, the thorax, and the foot of the male are 

 here reproduced on pl.35. 



Of the remaining figures, that of the male forceps is like 

 that of Eretuioptera brown i Kellogg, shown in fig-24, 

 pl.Hr>. excepting that the basal joint of the latter is somewhat 

 longer ; and the legs of the male of Psamathiomyia are 

 shown as being proportionately longer than in the American 

 species. Of the structural specific characters the following are of 

 especial importance. The eyes are prominent and convex; the 

 facets are large and hemispherical; the. ocelli are absent. Each 

 eye carries at its posterior lateral edge a black chitinous append- 

 age of an oblong shape and of unknown use. The palpi are con- 

 spicuous, two-jointed, the terminal joint rich in sensory bristles. 

 The empodium of both sexes is deeply fringed by a series of 

 lengthened simple as well as forked or bifid teeth upon its outer 

 edge, while its inner edge is quite smooth. The tergites of the 



