394 THE CANADIAN ENTOMOLOGIST 



A REMARKABLE NEW SPECIES OF PHORA {TRINEURA). 



BY CHARLES T. BRUES, BUSSEY INSTITUTION, HARVARD UNIVERSITY. 



The genus Phora, more gcneralh' known under the name of 

 Trineura, includes a small number of speeies of \el\ety black 

 colour. Quite recently Prof. J. M. Aldrich received from Manitoba 

 a series of specimens which he at once recognized as an undescribed 

 species. Instead of the \el\et\- black colour so characteristic 

 of the other members of ihe genus, the mesonotum of the male 

 is satiny blue-green, while the remainder of the body exhibits a 

 less distinct tinge of the same colour. StructuralK-, the species 

 departs in no striking way from its congeners. 



On account of its peculiar appearance he suggested that I 

 describe it at the present time. 

 Phora ( =Trineura) viridinota, sp. nov. 



Male. — Length L5 mm. Black; mesonotum and scutellum 

 blue-green and opatpie; abdomen almcst black, but siightU- tinged 

 with greenish; front grc\ish green; knees of four anterior legs and 

 front til)i;e and tarsi brownish testaceous; wings hyaline, costal 

 vein black, first and third \eins dilute piccous. Front slightly 

 more than twice as high as broad, its bristles large and strong 

 except the lowest pair, which are half the size of the others. Ocelli 

 in an equilateral triangle, the posterior ones as far from one another 

 as from the eye-margin. AntenniP small, oval, with bare arista. 

 Palpi \ery small, half as long as the antenna\ with stout, closely 

 placed, although sma.ll. bristles. Pcstocular cilia enlarged below. 

 Mesonotum sparsely clothed with bristly hairs; with a single 

 pair of \ er\- prominent dorsocentral macrochaHcC in front of the 

 lateral angles of the scutelhmi. Scutellum subtriangular, nearly as 

 wide as long, with one pair of stout bristles and a very weak pair 

 anterior to the stout ones. Propleura liristly along the entire 

 posterior edge, the bristles larger near the coxa; mesopleura bare. 

 Abdomen with the second and sixth segments elongated, the sixth 

 mcst noticeably so. Hypopygium, when viewed from the side, 

 with the median plate extending posteriorK- into a finger-like 

 projection which is longer than in P. aterrima. Anterior legs 

 with the tarsi not wider than the tibia'; metatarsus one-third 

 as long as the tibia; second tarsal joint a little widened, less than 

 half as broad as long; third twice, and fourth nearlv twice as long 



Novembtr, 1910. 



