ERIOCERA. 24t 



four posterior cells (E. longicornis, wilsonii, and fuliginosa) ; 

 one species has five {E. spinosa) 



The forceps of the male is not unlike that of the typical Lini- 

 nophilee, that is, it consists of two elongated, subcylindrical basal 

 pieces with a horny unguiform and an obtuse, apparently cori- 

 aceous appendage, attached to each (compare, for the details, 

 the description of the figures. Tab. lY, figs. 28 and 29). The 

 oviposj^r of the female consists of two elongated, pointed, 

 rather narrow, nearly straight or gently curved upper valves, and 

 a pair of lower ones, which are shorter. But the female of E. 

 longicornis (provided what I have before me is really the female 

 of this species) has the ovipositor of an entirely difi'erent struc- 

 ture, and exactly similar to that of Anisomera. It is short, 

 blunt, and somewhat directed upwards (at least in dry speci- 

 mens) ; its upper valves are shorter than the lower ones. I have 

 not seen the female of E. wilsonii. 



The relationship between Eriocera and Anisomera appears: in 

 the abnormal structure of the antennae, their frequent extraordi- 

 nary length in the male, and aberrant structure in the female ; the 

 peculiar shape of the collare ; the very unusual structure of the 

 ovipositor of the latter genus, which structure occasionally re- 

 appears in Eriocera. 



Every one of the four North American Eriocerse at present 

 known shows peculiarities of structure which, in some of the other 

 sections of the 2'i2:)ulidas, would have been sufficient for a generic 

 separation ; here, these same characters do not seem to have any 

 other but a specific value. In oi'der to compare the principal of 

 these characters, we may tabulate them as follows : — 



A. Antennae of the male very long and much longer than those of the 



female. 



1. Antennae of the male glabrous on the upper side, and with a series 



of bristles, inserted at regular intervals on the under side 

 (ARRHENICA O. S., olim). 



a. Five posterior cells . . . . . E. spinosa. 



b. Four posterior cells E. longicornis. 



2. Antennae of the male finely pubescent on both 



sides. 

 a. Four posterior cells E. -wilsonii. 



B. Antennse short in both sexes. 



a. Four posterior cells E. fuliginosa. 



