THE CANADIAN ENTOMOLOGIST. 



169 



width 1.16 mm.; cornicles 0.77 mm.; cauda 0.31 mm. 

 measurements as follows: 



Antennal 



Eulachnus rileyi (Williams) * 

 This species is very closely related to Eulachnus agilis Kalt., 

 both in form and in its habits, but differs from that species as 

 described by G. Del Guercio by lacking sensoria on antennal 

 segment III of the winged viviparous female. Del Guercio does 

 not refer to the ssnsoria in his description, but in his figure on 

 Plate XVII (fig. 227)* he shows the antennae of the winged vivi- 

 parous female of E. agilis to bear 8 sensoria on segment III, 3 

 sensoria segment IV, 2 sensoria on segment V, and the usual ones 

 on segment VI. 



Wingless viviparous female. 

 (PI. VII, fig. 41.) 



Head dusky brown; the prothorax likewise dusky, with a 

 paler median dorsal line; remainder of body varying in colour from 

 orange brown to nearly black or greenish black, usually the former; 

 a longitudinal row of black dots on each side of the dorsal median 

 and another row of similar dots lateral of this, each dot bearing a 

 long spine-like hair; in life the body is usually covered with a pulveru- 

 lence, giving the insect a hoary appearance and usually obscuring 

 all markings. Antennae, head, legs, and cauda, as well as the 

 body, bearing numerous conspicuous, long, black, spine-like hairs. 

 Antennae dark brownish to blackish, excepting basal halves of IV 

 and V, and extreme base of VI, which are paler; segment III 

 longest; total length about one-half that of the body; segment IV - 



*This species has not been positively identified, since the tvpe specimen.-; are not available. 

 The male of our species agrees well with the winged form as described by Williams for L. rileyi 

 and the identification as here recorded is probably correct. 



