60 Journal New York Entomological Society. [\'oI. xxvi. 



sate and armed with fine teeth; the first segment of the antenna is 

 longer than the basal segment of the rostrum. Both genera belong 

 to the Rhyparochromini. 



Peritrechus saskatchewanensis new species. 



Head, anterior lobe of pronotum, scutellum and beneath, dull black; 

 antennae, basal segment of rostrum, legs except apices of femora, middle por- 

 tion of tibia and basal segment of tarsus, piceous ; narrow anterior and lateral 

 margins and posterior lobe of pronotum, two spots on scutellum, hemielytra, 

 narrow anterior and posterior margins of prosternum, posterior margin of 

 metasternum and acetabulse, ochraceous ; second and third segments of ros- 

 trum, knees of femora, middle part of tibiae and basal segment of tarsi 

 testaceous. 



Head transverse, across eyes as wide as anterior margin of pronotum. 

 Antennje finely pilose, first segment short, barely exceeding apex of tylus, 

 second segment one-third longer than third, fourth segment almost equal to 

 second. Rostrum with basal segment reaching base of head, second segment 

 only slightly longer than third. Pronotum very transverse, almost twice as 

 wide as long, black impunctate anterior lobe about equal to the length of pale 

 posterior lobe, the latter punctate with fuscous ; anterior margin very lightly 

 arcuate, almost straight ; lateral edge carinate, these marginj almost straight 

 and converging gradually, abruptly rounded back of eyes. Scutellum longer 

 than wide, fasciate with ochraceous on either side, behind middle, finely and 

 sparsely punctate on the disk, coarsely punctate on either side of the apical 

 portion. Clavus with four irregular series of fuscous punctures, the two 

 inner series confused and abbreviated. Corium except for central discal spot 

 and costal margin anteriorly rather closely and evenly punctate on a pale 

 ochraceous background. Membrane reaching apex of abdomen, pale, mottled 

 with fuscous towards base. Fore femur with a short median tooth, another 

 larger one midway between this and apex, followed by two or three smaller 

 teeth towards apex. Anterior tibia gently curved. Posterior tibia with two 

 rows of short setose bristles, especially towards apex. Posterior tarsus with 

 basal segment almost equal to second and third together. Venter very finely 

 and closely punctate and clothed with fine incumbent hairs. Length 5 5 rnm 



Type 5 Oxbow, Sackatchewan (coll. by F. Knab). Paratype 5' 

 Los Angeles Co., Cal. (coll. by Coquillet), both in the collection of 

 the U. S. N. M. 



In the paratype the second and third segments of the antennae 

 are only black at apex. This species differs from the three other 

 described species in being broader in proportion to length. Further 

 differences are found in the more widely carinate lateral margins of 

 the pronotum which are pale, the edge not at all sinuate ; the prono- 



