1916.] NATURAL SCIENCES OF PHILADELPHIA. 197 



from alutacea, except in the case of brown-phase females, regarding 

 which see below under obsciwa. The other species has been the 

 cause of considerable difference of opinion, two names, alutacea 

 Harris and rubiginosa Scudder, the first based on striped individuals, 

 the other one on brown or reddish brown unstriped specimens, being 

 involved. The present authors have individually and collectively 

 expressed their opinions regarding the specific identity of these 

 forms, 66 and in the light of the present material we see no necessity 

 for changing, or in any way modifying, our former conclusions. 



In both species we find developed two color phases : one olivaceous 

 or deep wine color, having a medio-longitudinal yellow stripe on the 

 head, pronotum and anal area of the tegmina, the other being of a 

 more or less uniform brown or red brown color without any distinct 

 medio-longitudinal line. Correlated with these color differences 

 we usually find readily perceived structural differences in both 

 obscura and alutacea, the striped phase typically having the pronotum 

 more tectate, more compressed and appreciably narrowing cephalad, 

 and the head narrower with the fastigium more produced. The 

 brownish phase typically has the pronotum less tectate, more robust 

 and less narrowing cephalad, while the head is broader with the 

 fastigium blunted, broader and more declivent. The first of these 

 forms in alutacea is alutacea s.s., the second is rubiginosa, regarding 

 the distinctness of which Morse says, 67 "typically these two species 

 differ in color, structure and haunts." Later the same author 

 modifies his first statement, restricting it to New England material 68 

 as follows: "It is very probable that some so-called species are but 

 forms of one which varies greatly in color and structure. In New 

 England the two forms known as alutacea and rubiginosa seem to 

 be constantly different structurally, though rubiginosa has a color- 

 variety resembling alutacea. Southward and westward the structural 

 gap between the two seems to be bridged, and both vary much in 

 size, color, form, and proportions of parts." If we were called upon 

 to deal only with typical material, it would be an extremely simple 

 matter to consider the two phases as species, but unfortunately a 

 very considerable portion of our series is not typical, but apparently, 

 and when carefully studied actually, intermediate not only in color 

 but so, more rarely, however, in structure and proportions. The 



66 Ent. News, XIII, p. 89, (1902); Ibid., p. 312, (1902); Proc. Acad. Nat. Sci. 

 Phila., 1907, pp. 292, 293, (1907). 



"Carnegie Inst, Wash., Publ. 18, p. 39, (1904). 



68 Carnegie Inst, Wash., Publ. 68, pp. 43-44, (1907). 



14 



