PENTHOPTERA. 25 T 



very much smaller, occupying but a small portion of the space 

 between the tip of the auxiliary vein and the marginal cross-vein ; 

 the subcostal cross-vein is still nearer to the tip of the auxiliary 

 vein; the marginal cross-vein, on the contrary, a little more 

 distant from the tip of the first longitudinal vein. Both P. chiro- 

 thecata and P. albitarsis have the tarsi white — a striking character 

 not observed in the genus Eriocera ; compared to the tibia), the 

 tarsi are shorter here than in Eriocera, especially the hind ones. 



As in Eriocera, the antennae of the male are sometimes very 

 long, and much longer than those of the female (P. albttarm) ; 

 sometimes they are short in both sexes (the two European 

 species). The occurrence, in the different species, of either five 

 or of four posterior cells also reminds of the former genus (P. albi- 

 tarsis and chirothecata have five, P. cimicoides four of such cells). 



The antennae of the male are apparently six-jointed ; on those 

 of a fresh specimen of the female of P. albitarsis I have distinctly 

 counted ten joints. Those of the two European species, in both 

 sexes, when bent backwards, would hardly reach beyond the root 

 of the wings ; the third joint is the longest ; the flagellum is 

 sparsely clothed with hairs. The antennae of the female of the 

 North American species have exactly the same structure ; those 

 of the male are nearly as long as the body, filiform, covered with 

 a short, soft pubescence. The structure of the palpi seems to be 

 like that of Eriocera. The male forceps, likewise, resembles that 

 of Eriocera ; the ovipositor has the ordinary structure ; the upper 

 valves are slender, pointed, and very gently arcuated. 



As I have observed in my remarks on the preceding genus, the 

 subdivisions of Eriocera have been too little studied yet, as to 

 decide upon the relative value and position of the allied genera ; 

 Penthoptera is among the number of the latter. 



Dr. Schiner has described a new species (P. fuliginosa) from 

 Columbia, South America (Peise d. Novara, Diptera, p. 42). 



The name of the genus is probably derived from nh$o$, sorrow, 

 and rtttpbv, wing, in allusion to the dark-colored wings of the 

 European species. 



Description of the species. 



1. P. albitarsis, n. sp. % and 9. — Fuscana, capite superne prui- 

 noso, tarsis albis ; antennis maris longitudine corporis, feminse multo 

 brevioribus ; cellulis posterioribus quinque. 

 17 October, 1868. 



