THE CANADIAN ENTOiMOLOGIST. 237 



thinner, more interrupted on 2; basal i:)rocess of labruni shorter, more 

 rounded] second submarginal cell usually relativel\' shorter compared with 

 third. 



^ . Differs from the male of A. THiiioensis by the scutel being finely 

 rugose and opaqiie, often without purplish; apex of abdomen rather pointed 

 and with a small tuft; ventral segment 6 not reflexed; hind tibiffi and tarsi 

 more fretpiently yellowish. 



Carlinville, Illinois; 39 9 , 47 c? specimens. A. Illinociisis has the 

 scutel smooth and shining. The $ type specimen has the fasciie on seg- 

 ments 2-4 quite thin and white, but fresher specimens have the fascL-e 

 more dense, more ochraceous and hardly interrupted on 2. The male of 

 A. Illuioeiisis has the sixth ventral segment reflexed and bordered with 

 dense pubescence, so that the apex of the abdomen appears to be open, 

 the orifice densely pubescent, the apex thus bearing a great tuft. 



Andrena nigra, sp. nov. Andrena lUinoensis ioxm. bicolor, Tr. A. S. 

 St. Louis 8: 46, 1898. 



This is more nearly related to A. salictaria than to A. Illinocnsis. 

 Peculiarities in its time of flight and flower visits seem to make it desir- 

 able to sei)arate it as a distinct species. The name refers to Salix nigra, 

 the only flower on which I have found it collecting pollen. A. lUinoensis 

 and salictaria are likewise oligotropic visitors of Salix. 



A NEW ROACH FROM PORTO RICO. 



BY A. N. CAUDELL, WASHINGTON, D. C. 



IscJuioptcra adusta, n. sp. — Description — Male: Colour dark yel- 

 lowish, with eyes black and the disc of the pronotum slightly mottled with 

 fuscous and the tips of the elytra and wings fuliginous. Anterior femora 

 beneath on the inner margin armed on the apical two-thirds with about 

 ten semiequal, equidistant spines, the basal third unarmed. Subgenitai 

 plate roundly incised apically; apical styles long, slender rigid spines 

 extending about half their length beyond the apex of the subgenitai plate; 

 cerci long, fusiform. 



Length, pronotum, 3.5; elytra, 15; width pronotum, 4 mm. Type 

 number 8400, United States National Museum. 



One male, Arroyo, Porto Rico, at light, Feb., 1899; Aug. Busck, coll. 



The infuscated apices of the elytra and wings of this Roach will serve 

 to identify it readily, and the armature of the fore femora and the rigid 

 anal styles are different from most American species. 



