34 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.59. 



of large bristles characteristic of the higher flies should have been so 

 fully developed as far back as the Eocene. To-day this development 

 of large bristles is more especially characteristic of forms which have 

 larvae parasitic on other insects ; but it would be going too far to aflirm 

 that Acanthomyites was necessarily parasitic. Doctor Aldrich writes: 

 "I do not recall any cases among existing flies where the dorsocentral 

 bristles are reduced, and at the same time the anterior acrostichals 

 are larger than common, or in fact larger than the dorsocentrals." 

 Holotype— -Cat. No. 66925, U.S.N.M. 



HOMOPTERA. 

 Family FULGORIDAE. 



DELPHAX (sens, latiss.) VETERUM, new species. 



Plate 8, fig. 6. 



Length about 3.5 mm.; tegmina 4.3 mm. long and 1.8 mm. wide; 

 fuscous, except the metathorax, basal 0.5 mm. of abdomen, and last 



„ two abdominal segments (except laterally), which 



are colorless ; body stout, abdomen nearly 1.5 mm. 

 wide; head short, obtuse; scutellum large, very dis- 

 tinctly tricarinate, its lateral margins only very 

 feebly concave; tegmina broad, with convex costa, 

 the shape and dark color suggestive of Cercopidae. 

 The details of the venation can not be made out, 

 fig. 7— delphax but the little that can be seen, both on tegmina 

 ETEituM. scutellum. anc i h mc i wings, agrees sufficiently with Delphacinae. 

 In the hind wing the median cell ends broadly in the usual manner. 

 Eocene; "Cathedral Bluffs south of Little Tommies Draw at point 

 where samples were taken." (Winchester 17-5, U. S. G. S.) Resem- 

 bles Delphax senilis Scudder, from the White River Eocene, but is 

 larger. I follow Scudder in using the name Delphax in a broad sense, 

 as it is not possible to determine the genus accurately. The sides of 

 the scutellum are straighter than in the majority of modern American 

 Delphacinae. 



Hohtype.—C&t. No. 66926, U.S.N.M. 



HETEROPTERA. 



Family PENTATOMIDAE. 



DINIDORITES, new genus. 



Narrow for Pentatomidae, the general outline suggesting Margus 

 in the Coreidae; head prominent, broad, obtuse; antennae four jointed, 

 the joints darkened apically, pallid basally; pronotum short, fully 

 twice as broad as long, broadly rounded laterally, not angulate; 

 scutellum large but not reaching to middle of abdomen; pronotum 



