SEPEDON. 127 



somewhat spotted with brown at the tip ; their under side has 

 a rather deep excision, and immediately before this excision a 

 coarse, almost two-headed, hook, and farther to the base a smaller 

 obtuse tooth, the space between the excision and the tip being 

 beset with short black bristles. The femora of the female are 

 simple. The posterior tibia? of the male are much arcuated at 

 the beginning of their last third, the two first thirds being almost 

 quite straight ; the tibiae of the female are of a very similar struc- 

 ture, but not quite so much curved, by which character it is most 

 readily distinguished from the female of Sepedon pusillus, the pos- 

 terior tibiae of which have a slighter and much more uniform 

 arcuation. The anterior tibiae are gradually blackened towards 

 the tip, and also the anterior tarsi are rather black, the second 

 and third joints only being paler than the rest ; the middle tibiae 

 show no trace of black, but the tips of the middle tarsi are blackish 

 as well as those of the hind tarsi. Wings smoky gray, more 

 yellowish-brown on the costal border; the transverse veins with 

 narrow black clouds; the posterior transverse vein is but little 

 curved, and rather steep. 



Hob. Middle States. (Osten-Sacken.) 



4. . pusillus LOEW. and Brunneus, antennarum articulo se- 

 cundo tenui, femoribus posticis incrassatis, in utroque sexu simplicibus. 



Brown, second antennal joint slender, femora thickened, simple in both 

 sexes. Long. corp. 0.18. Long. al. 0.18. 



SYJT. Sepedon pusillus LOEW, Wien. Ent. Monatsch. Ill, 299. 



So very similar to the preceding species that a short enumera- 

 tion of its differences will be sufficient to characterize it. The 

 male is most readily distinguished from that of Sep. armipes by 

 its hind femora being simple. The females of the two species are 

 rather more difficult to separate ; the most certain difference is 

 given in the form of the hind tibia?, which in Sep. pusillus are 

 slightly and uniformly bent in their whole length, whereas in the 

 female of Sep. armipes the arcuation is not only more considerable, 

 but also affects chiefly the last third. All other differences are 

 either uncertain or trifling ; namely, the structure of the third joint 

 of the antennae does not afford any available character for distin- 

 guishing the two species, in opposition to what I was inclined to 

 suppose when I had only a few specimens of both of them. 



Hob. Middle States. (Osten-Sacken.) 



