276 PROCEEDINGS OF THE ACADEMY OF [April, 



certain of the specimens considered to be terrestris by Scudder, in his 

 description of the latter, are really neglectus. This is true of the two 

 specimens from Chateaugay Lake, which, while quite small, are dis- 

 tinctly neglectus. Just how much of the original series of terrestris 

 belongs to neglectus we cannot say at the present writing, but, as 

 Walker has shown, the few adult males in the Scudder Collection 

 represent the latter species. 



As Walker has said in explanation of his figure of the subgenital 

 plate of the male of this species, 13u the type there shown is that of the 

 immature male. This portion of the adult male is different, having 

 no distal projections and with the free margin arcuato-truncate or 

 weakly emarginate, the plate entire or undivided, a median fold or 

 sulcus frequently present distad, but this is not a true division of 

 the plate. The supra-anal plate of the adult is elongate, trigonal- 

 linguiform, taken with the shape of the adjacent dorsal abdominal 

 segments and the subgenital plate being characteristic of the species. 



The ovipositor of the female bears five, or more rarely six, teeth on 

 the internal valves. 131 The individual size variation in adults of the 

 species is very great, so much so that the extremes might not be 

 recognized as the same species, as the larger specimens, by their 

 bulkiness, have a different general appearance. In the Alexandria 

 County series the extremes in size (in millimeters) are as follows : 



c? d* 9 9 



Length of pronotum 4.8 6 4.9 6 



Length of cephalic femur 5.6 6.9 5 5.6 



Length of caudal femur 12.5 16 10.4 13.6 



Length of caudal tibia 12.8 15.5 10.8 13.4 



Length of ovipositor 5.9 7.4 



The coloration is quite variable in the depth of the pattern, which 

 in the paler specimens has a decided medio-longitudinal pale line 

 on the thoracic segments, and a closely tessellate abdomen, 

 which in the darker individuals has the median line subobsolete 

 and the tessellations reduced in number, although but little in inten- 

 sity. The caudal femoral scalariform pattern, which is generally 

 moderately indicated, frequently strongly marked, is relatively poor 

 in contrast in the darker individuals. 



™Can. Ent.', XXXVII, p. 117, pi. V, figs. 3&-3c, (1905). 



131 In very rare instances, only two females from Alexandria County, Virginia, 

 out of one hundred and seventy-five examined for this character, we find but 

 four teeth present on these valves, but in these individuals the usual two distal 

 teeth are fused and the form of the caudal femora and margins of the same 

 correctly associate the specimens. 



