218 



THE ENTOMOLOGIST. 



like female belongs to tridentula, and the modesta-like one to 

 ivootoni. 



Colorado. — Mr. C. F. Baker has collected a surprising number 

 of species, showing apparently that the higher elevations in this 

 State are the metropolis of the genus in the U. S. From the 

 males I have described P. bakeri (7000 ft.), citrinifrons (8500 ft.), 

 tridentula (9500 ft.), rugosula and var. fallax (9500 ft.), tridens 

 (7000 ft.), divergens (7000 ft.), episcopalis, coloradensis (9500 ft.), 

 digitata, and rudbeckice race subdigitata. I have also recognised 

 amongst Mr. Baker's Colorado material the described species 

 basalis, Sm., varifrons, Cr., and pygmcea, Cr. I have taken 

 P. mesillcs, Ckll., on Cleome semdata at La Junta, Colo., but 

 that is on the plains. P. affinis, modesta, elliptica, and verticalis 

 have been recorded from Colorado; elliptica is probably found 

 there ; but the others have probably been erroneously identified 

 from such allied forms as citrinifrons, tridentula, &c. In the 

 U. S. N. M. is a specimen taken by the writer in Custer Co., 

 Colo., a female. It is of the varifrons type, but has a broken 

 pale band on anterior edge of clypeus. The tegulse have a light 

 spot. I suppose it is varifrons, but it approaches elliptica. 



Montana. — The U.S.N.M. contains two females of the vari- 

 frons type, presumably that species. Both have the hind border 

 of prothorax dark, and the spot on tegulse. 



Utah. — The Coll. Am. Ent. Soc. contains male varifrons and 

 female basalis. 



Idaho. — The U.S.N.M. contains two female varifrons, col- 

 lected by Prof. L. Brunei* in Beaver Canon. One has the hind 

 border of prothorax partly light, the other has it all dark ; the 

 latter lacks the spot on tegulse. 



Nevada. — Two species, suffusa and nevadensis, are known 

 only from Nevada. A female from Nevada, in Coll. Am. Ent. 

 Soc, is of the varifrons type, with spots on tegulge, but there is a 

 large rufescent patch on the anterior part of the clypeus. The 

 first abdominal segment is smooth. 



California. — P. coquillettii is a distinct species from Los 

 Angeles Co. A female collected by Coquillett, also in Los Angeles 

 Co., seems to belong to it ; it has the lateral face-marks much as 

 in varifrons, only shortened and abruptly rounded above. The 

 anterior part of the clypeus is obscurely rufescent. 



Male specimens from Gala, in Coll. Am. Ent. Soc. represent 

 four species, thus : — 



(1.) P. bakeri, Ckll. With all the distinctive characters of 

 this well-marked species, but the wings are browner than in the 

 type. 



(2.) P. ruidosensis, Ckll., var. with spot on tegulae. One of 

 the slightly modified rudbeckics types; from a single specimen 



