PROC. ENT. SOC. WASH., VOL. 23, NO. 2, FEB., 1921 27 



Ctenidia of abdominal tergites composed of small spines which are not in 

 close-set rows; genal cteniclium ot 6-7 spines; nearctic .. 2. 



2. Pronotal ctenidium of 46 spines; body of receptacula scminis more than 



210 /x long ' schejferi Chnpin. 



Pronotal ctenidium of 36-38 spines; body of receptacula seminis less than 

 210 M long... 3. 



3. Body of receptacula seminis 184-199 n long; nine bristles in upper row on 



frons mammoth Chaphi. 



Body of receptacula seminis 169 /u. long; seven bristles in upper row on 

 frons.... - dippiei Rothsch. 



For convenience, the exact dimensions of the receptacula 

 seminis in the three species before me are given in the following 

 table. As there are two receptacula in each female in the species 

 of this genus, two columns of dimensions have been given. All 

 measurements given in micra. 



Species Anterior Posterior 



H. schefferi Chapin. 215 x 123 230 x 138 



H. mammoth Chapin. 199 x 138 184 x 154 



H. dippiei Rothsch. 169 x 108 169 x 108 



SOME NEW ORTHOPTERA FROM MOKANSHAN, CHINA. 



BY A. N. CAUDELL, Bureau of Entomology. 



Among a consignment of Orthoptera recently received for 

 determination from Prof. N. Gist Gee, of Soochow, China, were 

 several forms apparently undescribed. All of these are from 

 Mokanshan, China, and descriptions of them are here given. 

 Types and allotypes are retained in the collection of the U. S. 

 National Museum and the paratypes are divided, some being 

 retained in that collection and some returned to Prof. Gee. 



Megaulacobothrus, n. gen. (Truxalinae). 



Agreeing closely with the characters given by Bolivar for his 

 genus Aulacobothrus except that the inner calcaria of the pos- 

 terior tibiae are equal. The species is decidedly larger however 

 than any of those placed in the above genus by its author, and 

 there is probably little relation between the two genera, in spite 

 of the similarity of characters. 



Description, male and female. Vertex moderately acute in both sexes, some- 

 what more so in the male; above slightly convex and without median carina; 

 fevolae distinct, wholly visible from above, about three times as long as broad 

 in the male and slightly less in the female; antennae filiform, those of the male 

 more than twice as long as the head and pronotum combined, those of the female 

 scarcely twice as long; frontal costa nearly flat, somewhat concave at the ocellus, 

 the sides converging almost uniformly, sometimes more rapidly towards the 



