THE CANADIAN ENTOMOLOGIST 



253 



chitinized and the venter becomes much expanded (Fig. 36A). This dorsal, 

 chitinized area is destitute of spines and pores except around its margin where 

 there are numerous slender setae and pores of the type shown in (Fig. 36B). 

 There are also numerous setae about the vaginal orifice. The antennae (or what 

 appear to be the antennae) arc a pair of small, tubular, wrinkled, chitinous 

 structures, usualh' appearing behind the mouth-parts and presenting no traces 

 of segmentation. The internal framework of the mouth-parts in -unusually 





v.v 





Fig. 36. — Eremococcus pirogallis (Maskell) ; A, adult female, 

 from dorsal aspect; B, type of pore. 



large, and the rostrum is borne upon a prominence, the derm of which presents 

 a somewhat papillate appearance. I have been unable to detect any trace of 

 tubular ducts. 



The first stage larva is as described under the genus. My material is not in 

 sufficiently good condition to permit the presentation of figures. 



Material examined. — Specimens from Froggatt and from Ehrhorn, de- 

 termined as this species and agreeing with the original description. 



WILSONIA— A CORRECTION. 



A curious case of lapse of memory occurs in my article, Canadian Ento- 

 mologist, Vol. LI, p. 212. Although I know several species of Wilsonia I used 

 this name for a genus of Aphids. Both Dr. Cockerell and Mr. Criddle have 

 called my attention to it. It is inexcusable. I herewith substitute the name 

 Dilachnus. • A. C. Baker. 



