128 



[June, 



whom I have submitted specimens, is of opinion that it should be 

 assigned to the latter species. But I have found constant differences 

 in the size and form of the pygidial lobes, and in several other characters, 

 that lead me to believe that gaultlieriae is a distinct species. Fig. 7, 

 in which I have shown the posterior margins of (6) gaultlieriae, 

 (^) argentosis, and (</) cycadis—2i\\ drawn to the same scale — reveals 



Fig. 7. — Poliaspis ganlfheriae : a, posterior margin of nymph, X 450; b, ditto, of 

 adult $ , X 450. Poliaspsis argentosis '■ c, posterior margin, adult $ , X 450- 

 Poliaspis cycadis : d, posterior margin, adult § , X 450. 



the diverse character of the lobes in the three species. The differences 

 may be stated as follows : — 



Median lobes {(jaidtheriae). Deeply recessed; scarcely projecting beyond 

 margin; free edge minutely serratulate ; apex practically 

 at tlie outer edge ; no densely cbitinous basal fold ; greatest 

 width about one-third more than distance between first and 

 second squames. 

 {argentosis). Moderately recessed ; distinctly projecting beyond 

 the margin ; free edge coarsely dentate ; apex at a short 

 distance from outer edge ; a dense chitinous fold across the 

 base ; greatest width twice the distance between lirst and 

 second squames. 



