8* 



THE CANADIAN ENTOMOLOGIST. 



NOTES ON TENTHREDINOIDEA, WITH DESCRIPTIONS OF 



NEW SPECIES. 



BY S. A. ROHWER, BOULDER, COLO. 



(Paper III.) 

 Pteronus Cockerelli, n. sp. — ? . Length, 6 mm.; length of anterior 

 wing, 6 mm.; length of antennae, 5 mm. Head and antennas shining; 

 sparsely, finely punctured. Clypeus distinctly circularly emarginate ; lobes 

 rather broad triangular, obtuse at apex. Antenna! (ovew small, not very 

 distinct. Middle fovea dee]), oval, wall rather pointed toward the clypeus. 

 Side walls of the ocellar basin sharp, strong. Frontal crest strong, slightly 

 broken in the middle. Lateral ocellar furrows broad, shallow. Antenna' 

 long, third and fourth joints equal ; apical joint slightly longer than the 

 preceding one. Maxillary palpi long ; last two joints equal, the third 

 from apex the shortest ; third joint subclavate toward apex. Claws deeply 

 cleft, teeth equal ; the inner tooth is perhaps a little the stouter. Basal 

 joint of hind tarsi a little longer than 2 + 3. Venation normal ; the first 

 transverse cubitus faint ; third cubital cell not unusually broader at apex 

 than at base ; upper discal cell of hind wing exceeding the lower on 

 the outer margin. Stigma short, very broad, ovate, rounded at apex ; not 

 quite twice as long as broad in the widest part. Sheath broad, short, 

 obliquely truncate at the apex ; marginal hairs very minute. Cerci short, 

 stout. Head reddish-brown, with a black spot around the ocelli. Thorax, 

 except the angles of pronotum and tegulae which are pallid, and the 

 lateral lobes of mesonotum posteriorly and scutellum which are brownish, 

 black. Abdomen, except basal plates and basal part of first segment and 

 apex of sheath which are black, reddish-brown. Four anterior legs, coxje, 

 trochanters and basal half of posterior femora pallid (the anterior femora 

 are slightly reddish). Apical half of posterior femora, apex of posterior 

 tibiae and their tarsi black; basal two-thirds of posterior tibiae reddish- 

 brown. Antennae, except two basal joints, bright rufo-ferriiginous. 

 Wings yellowish-hyaline, iridescent ; venation dark brown, costa somewhat 

 and extreme basal part of stigma pallid. 



Habitat. — Campus of University of Colorado, Boulder, Colo., August, 

 1908. Collected by Prof. T. D. A. Cockerell, to whom I take great 

 pleasure in dedicating this pretty species. 



In Marlatt's Revision of the Nematinae of N. America, this species 

 runs to tricolor, Marl. (New Hampshire), but it differs as follows from his 



March, 1909 



