June, 1908.] Rohwer: New Western Tenthri.dimi' 1 . 109 



does not widen strongly behind the eyes. There may be a little ob- 

 scurity in this part of Marlatt's table. Taking it as the head narrower 

 behind it runs to palliventris Cress., from which it may be known 

 by the vertex not being tuberculate, the third antennal joint not the 

 longest, the tergum entirely black, etc. 



9. Pristiphora dawsoni, new species. 



Female. — Length 7 mm.; length of anterior wings about 7 mm. Robust ; head 

 not as wide as thorax, densely and moderately coarsely punctured ; clypeus truncate ; 

 middle fovea distinct, circular ; frontal crest strongly projecting, slightly broken ; 

 lateral walls of ocellar basin faintly visible ; antennal fovea; deep, somewhat pointed 

 above ; third, fourth and fifth antennal joints subequal. Midde furrow of anterior lobe 

 of mesonotum distinct for anterior two thirds ; thorax not nearly as strongly punctured 

 as head. Venation normal ; inner tooth of claw large, obtuse, near middle of claw. 

 Sheath broad, rounded on lower margin to apex, upper margin straight; cerci short, 

 robust. Color black ; apical margin of clypeus, labrum, mandibles (apex piceous), 

 angles of pronotum, tegulae, apical segment of abdomen, apices of coxa', trochanters, 

 basal two thirds of hind tibiae pallid ; anterior legs, except line on femora beneath, 

 reddish-yellow ; posterior femora brownish ; apex of posterior tibiae and tarsi black. 

 Wings hyaline, iridescent, nervures and stigma brown. 



Habitat. — Ute Creek, Costilla Co., Colo., 9,000 ft., July 4, 1907 

 (R. W. Dawson). 



Related to banksi M.a.r\. and bucoda Kincaid. It may be separated 

 from banksihy the distinct large tooth of claw, pale pronotum, larger 

 size, etc. From bucoda Kincaid it may be known by the black venter, 

 costa and stigma being brownish, pronotum in part pale, different 

 shaped sheath, etc. Type in the collection of University of Nebraska. 



10. Pristiphora maura, new species. 



Male. — Length 5 mm.; length of anterior wing 4.5 mm. Robust ; head not as 

 wide as thorax, rather sparsely covered with punctures, vertex rounded ; clypeus 

 truncate ; middle fovea almost wanting ; frontal crest shallowly excavated ; no trace 

 of ridges around ocelli ; antennal foveas deep, rounded above ; middle furrow of 

 middle lobe of mesonotum replaced by a carina. Thorax not as markedly punctured 

 as head. Inner tooth of claw near middle, rather small, obtusely pointed. Venation 

 normal, except that the first transverse cubitus is wanting ; stigma rounded on lower 

 margin, a little the widest across middle ; procidentia small. Color black ; apex of 

 mandibles piceous; tips of anterior femora, four anterior tibix and tarsi, basal two 

 thirds of posterior tibiae ferruginous. Wings hyaline, iridescent ; nervures, costa and 

 stigma brown. 



Habitat. — Ute Creek, Costilla Co., Colo., 9,000 ft., July 4, 

 1907 (R. W. Dawson). Type in collection of the University of 

 Nebraska. 



This species runs to siskiyonensis Marl. (Calif.) in Marlatt's 



