~ o ENTOMOLOGICAL NEWS. [Feb., 'l6 



wide; 7 and 8 stouter than the others, subequal, each as long as 3; 

 club stouter than the funicle, equal in length to the three preceding 

 joints or more. Club obliquely truncate from beyond the middle. 

 Mandibles with three equal, acute teeth. 



Described from one female captured April 26, 1915, in the 

 forest at Rock Creek Park, District of Columbia, by sweeping. 



Type : Catalogue No. 19353, U. S. National Museum, the 

 specimen on a slide. 



2. Ooctonus silvensis new species. 



Female: Differs from the preceding in having the legs, except the 

 yellowish hind coxae and whitish proximal three tarsal joints, jet black, 

 and the following antennal differences: Funicle i is distinctly longer 

 than 2, which is only somewhat longer than wide, no longer than 3; 

 6 is globular and shortest, shorter than 5, which is subequal to 4; the 

 marginal vein is distinctly longer; otherwise the same as far as could 

 be seen. Mandibles tridentate in both species. In this species the sculp- 

 ture is coarsely scaly except distad of a convex line on the scutellum 

 proximad of the middle, where it is glabrous. The propodeum has a 

 median carina, which diverges widely a little out from the base and also 

 strong lateral carinae. 



Described from one female captured with the preceding. 

 Type : Catalogue No. 19375, U. S. National Museum, the 

 female on a slide. 



Pink Katy-Dids and the Inheritance of Pink Color- 

 ation (Orth.). 



(PART ONE) 



By Dr. JOSEPH L. HANCOCK, Chicago, Illinois. 

 In 1907 Wheeler published a paper on "Pink Insect Mu- 

 tants," in which he brought together the various recorded in- 

 stances of the finding of pink katy-dids in the United States. 1 

 Moreover, in this resume some data gathered from personal 

 observations were presented in attempting to disprove the 

 earlier supposition that environmental conditions are respon- 

 sible for pink coloration in katy-dids. The assumption was 

 taken that the pink coloration could not result from temper- 

 ature acting on the normal green pigment. Katy-dids were 



American Naturalist, Vol. xli, Dec., 1907, pp. 778-780. 



