ERIOCERA. 247 



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 Lim- 

 nophilse, 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. IV, figs. 28 and 29). The 

 ovipositor 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 different 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. wilson ' 



The relationship between Eriocera and Anisomera appears : in 

 the abnormal structure of the antenna?, 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 Tipulidae, would have been sufficient for a generic 

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

 other but a specific value. In order 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 0. 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. Antennae short in both sexes. 



a. Four posterior cells E. fuliginosa. 



