626 PROCEEDINGS OF THE ACADEMY OF [Nbvi, 



treeless slopes and valleys. The individuals with general color pale 

 yellowish ochraceous were found almost invariably in the very bottom 

 of the valleys, and seemed a color adaptation in their resemblance to 

 the more plentiful whitish pebbles strewn about there. 



Several questions have been brought into prominence by the exami- 

 nation of this material, the first being in regard to the name. For- 

 tunately the type of Gomphoeerus simplex Scudder 10 is still in existence 

 in good condition in the Academy collections, and several efforts to 

 find some valid reason for recognizing the later and very poorly 

 characterized G. carinaius Scudder from the ''Middle States" having 

 failed, we are under the necessity of uniting the two, simplex having 

 six years' priority. At the present time we are not prepared to give 

 any expression on the exact relationship of this species and the western 

 allies with clavate antenna 1 , viz., E. virgatus, tricarinatus and navi- 

 culus. 



The other point is relative to the presence of marked dimorphism 

 and dichromatism in this species. The greater majority of the speci- 

 mens of this species before us possess distinct supplementary carina? 

 on the dorsum of the head and pronotum, the type of the species 

 belonging to this form, while nine males and seven females, repre- 

 senting both localities, have the supplementary carinse lacking on 

 the pronotum and weak or lacking on the head. A series of eight 

 males and one female from Sulphur Springs are intermediate between 

 the two extremes, having the supplementary carinse very faintly and 

 incompletely indicated on the pronotum and faintly or moderately 

 indicated on the head. 



There is a great amount of individual variation in the form of the 

 lateral carinas of the pronotum, some specimens having them sub- 

 parallel, distinctly not constricted mesad and rarely very slightly 

 convergent cephalad, while the great majority have the carinse con- 

 stricted more or less distinctly and sharply immediately cephalad of 

 the middle. There is no correspondence between these two conditions 

 and the presence or absence of supplementary carinse. The distance 

 between the lateral carinas of the pronotum is variable. In general 

 size the species varies considerably, particularly in the male sex. 



The dichromatism noticed is typically examplified by one form 

 with the general color pale yellowish ochraceous and the postocular 

 bars broad and solid, extending to the tegmina, and vandyke brown 

 in color, while the other type, which is by far the more numerous, has 



10 Trans. Amer. Ent. Soc, II, p. 305, 1869. (Delaware.) 



