132 [June 



rather sparsely with distinct punctures, which are confluent in front of 

 the scutelluni ; metathorax roughly punctured. Wings hyaline, ner- 

 vures black. Legs black, all the tibiae at base with an obscure whitish 

 spot, indistinct on the posterior pair. Abdomen long and slender, 

 black, the second, third and fourth segments ferruginous, the fourth 

 partly blackish ; ovipositor longer than the body, ferruginous, valves 

 black, their tips white. Length 5 — lines ; expanse of wings 6 — 7 

 lines. 



Hah. — Rocky Mountains, Colorado Territory. Four 9 specimens. 



Closely resembles the preceding species, but is smaller, the thorax 

 above has the punctures distinct and somewhat sparse, while occiden- 

 talia has the punctures rough and confluent, and the sides of the meso- 

 thorax transversely rugose ; otherwise the two species agree. 



3. F. montanus, n. sp. 



Black, half of the second, the third ami part of the fourth segment of the 

 abdomen rufous ; ovijjositor very short. 



Female. — Black ; tip of the antennae beneath testaceous ; thorax 

 without punctures, minutely shagreened ; metathorax roughly punc- 

 tured. Wings slightly tinged with fuliginous ; nervui*es and stigma 

 black. Ijcgs black ; anterior femora at base, apex of all their tibiae 

 within and all the tarsi more or less tinged with pale rufous ; posterior 

 femora beneath with a rufous stripe near the tip. Abdomen black, 

 the apical half of the second, the whole of the third and a part of the 

 fourth segments rufous; ovipositor very short, about 2 lines in length, 

 pale rufous, valves black. Length 5 lines ; expanse of wings 6 lines. 



H(ih. — Rocky Mountains, Colorado Territory. 



Distinct from all other species known to me, by its shorter and much 

 more robust form ; the abdomen is not so much compressed and the 

 segments are shorter in proportion to the length of the abdomen, than 

 in the other species. 



4. F. tarsatorius, Say. 



Fcenus tarsatorius Say, Long's Second Expedition, ii, p. 321. 

 This species seems to be closely allied to i^. Barnstonii Westw., from 

 Hudson's Bay, and having before me ten 9 specimens of Say's species, 

 it would perhaps be useful to give here a more detailed description of it. 

 which may serve to draw more closely the dividing line between the 

 two species. I have not seen any males of this species. 



