June, 1908.] ROHWER I NEW WESTERN TeNTHREDINID/E. ] 07 



June 22, 1907 (L. Bruner). Type in collection of Nebraska Uni- 

 versity. 



This species is most closely related to P. unicolor Marl. (Calif.) 

 but may be separated by the differently shaped clypeus, and the 

 stigma which is not acuminate and unicolorous and is darker. It 

 also bears resemblance to P. mendicus Walsh but may be distinguished 

 by the deeper middle fovea, and the frontal crest which is not 

 strongly broken and is much paler in color. It may be monochroma 

 Nort. but the pleurae are not darker than the rest of the body. The 

 type of monoch?'o?na is lost. 



6. Pontania utensis, new species. 



Female. — Length 4.5 mm.; length of anterior wing 4.5 mm. Robust, head 

 nearly as wide as thorax, rather densely covered with fine punctures; clypeus 

 moderately, deeply and circularly emarginate ; lobes broadly rounded. Third 

 antennal joint a little the longest, joints gradually decreasing in length ; middle fovea 

 distinct, circular; frontal crest not broken, rather strongly projecting, tooth like ; 

 ocellar basin indistinct, lower wall nearly, or quite obsolete, lateral walls low, rounded, 

 subparallel. Mesonotum not as densely punctured as head, the furrow of middle lobe 

 extending about half way across ; venation normal, except that the basal vein is 

 rather strongly bent at base. Claws deeply notched, teeth subequal, well separated. 

 Sheath broad, slightly excavated below, obtusely rounded at apex; cerci rather short, 

 stout. Color black, clypeus, labrum, mandibles (apex piceous), cheeks and face 

 below eyes, posterior angles of pronotum, tegulae pallid ; legs from apical part of 

 coxae reddish yellow ; femora beneath sometimes infuscated ; posterior and superior 

 orbits dark rufous. Wings hyaline, iridescent ; costa at base, stigma at base and in 

 middle pallid ; rest of nervures pale brown. 



Habitat. — Ute Creek, Costilla Co., Colo., 9,000 ft. Two $9 

 June 22, 1907 (R. W. Dawson), one $ July 1, 1907 ( R. W. 

 Dawson), one Q June 22, 1907 (L. Bruner). Cotypes in collection 

 of Univ. of Nebraska and in the author's own collection. 



Separated from excavata Marl, its nearest ally by the different 

 frontal crest, teeth of claws subequal and well separated, second 

 recurrent nervure not, or not nearly interstitial with second transverse 

 cubitus, antennae not lighter beneath, etc. 



7. Pteronus solitarius, new species. 



Female. — Length 7 mm. Head viewed from the side shows the vertex much 

 higher than eyes, slanting from the front (not so strongly as in Pteronus odoratut 

 Dyar) ; eyes oval ; ocellar basin large, well defined by narrow raised walls, the two 

 side walls running to lateral ocelli, thus being parallel or sub-parallel ; middle fovea 

 deep, triangular ; antennal fovese deep, pointed above the antennx. Antennae slen- 

 der, long, tapering, third and fourth joints equal, last two joints equal. Clypeus 

 angularly emarginate, lobes broad, pointed. Venation of hind wings about normal ; 



