30 



THE CANADIAN ENTOMOLOGIST 



Protodiaspis parvula Ckll. 

 \S98.—Protodiaspis parvula Ckll., Ann. Mag. Nat. Hist., (7), 1:428. 

 Material Examined. — Slide mount from the type material, from oak, 

 Mexico. 



Notes. — The material examined is not in sufficiently good condition to 

 permit the making of figures or of adding much to the original description. I 

 may note, however, that the insect is apparently very similar to P. agrifolm 

 Essig, differing chiefly in the absence of circumgenital pores. The dorsum of 

 the pygidium possesses numerous small ducts, as in the latter species. I am 

 unable to detect any lobes. The species is so very similar to agrifolicB that I 

 cannot regard the two as anything but congeneric. As P. agrifolice has a dis- 

 tinct scale, it appears quite possible that the original description of parvida is 

 in error in the statement that this species has no distinct scale. 



Protodiaspis agrifoliae Essig. 



Fig. 7. 



1914. — Protodiaspis agrifolice Essig, Journal Ent. and Zool., 6:75—80, figs. 



Habit. — Scale of the female white, circular, quite high convex; male, ac- 

 cording to the original description, "The exuviae of the males are yellow, and 

 their position is somewhat distinct from the posterior end. The scales are little 

 more than fluffy, snow-white cocoons, made of fine white cottony material. . ." 





Fig. 7. — Protodiaspis agrifoliae Essig. A, pygidium; B, type of duct. 



Adult Female. — Length .5 mm., form oval. Derm everywhere mem- 

 branous except for the anal ring, and a faintly chitinized area immediately 

 about and caudal of the anal orifice. Dorsum of the pygidum (Fig. lA) with 

 numerous small tubular ducts, and the margin of the body with a continuous 

 narrow zone of such ducts. Circumgenital pores present, arranged in an almost 

 continuous arch of 20—30 pores. There appear to be no gland spines at any 

 point on the body. 



Second Stage. — Figured by Essig as possessing small lobes, but in a mount 

 of the exuvia at hand it appears not to diff'er from the adult. 



Notes. — Structurally this appears to be so close to P. parvula that there 

 can be but little doubt that the two are strictly congeneric, in spite of the state- 

 ment that the former species possesses no definite scale. 



