G. C. DAVIS. 263 



with a triangular, usually petiolate areolet ; humeral cross nervure 

 of hind wing broken below the middle. Legs slender, claws pectinate. 



Posterior tibite black, witli distinct pale annulus. 



Abdomen black pedalis Cress. 



Abdominal segments 2 and 3 rufous. 



Posterior coxae rufous tiliialis Cress. 



Posterior coxse black varitarsus Grav. 



Posterior tibite without pale annulus; abdomen and coxje black. 



levictilus n. sp. 



Polyblastiis pc<lali$« Cress. (Tryphon), Proc. Ent. Soc. Phil, iii, 27.3. 



% 9 • — 5-6. .5 mm. Black, with clypeus, except extreme base, mouth-parts, 

 tegulse. and on hind legs broad annulus on basal middle of tibife, tibial spurs, and 

 more or less of basal portion of tarsal segments white, remainder of posterior 

 tibiae and tarsi, black ; rest of legs rufous; antennae dark brown, paler beneath ; 

 wings subhyaline, nervures and stigma brown, x>ale at base; stigma broad, trian- 

 gularly lanceolate; transverse median nervure unites slightly back of basal, 

 strongly sloping backward and curved posteriorly; face pilose. 



Thirteen specimens from Illinois, Michigan, New Hampshire, 

 Colorado, Nevada, Washington, Mt. Hood, Oregon, So. California 

 and Canada (type, coll. Amer. Ent. Soc). 



Pol.ybla$«tus tibialis Cress. [Tryphon), Proc. Ent. Soc. Phil, iii, 280, %. 

 Tryphon annidipes Cress., Trans. Am. Ent. Soc. ii. 108, 9 • 

 9 % ■ — 5-7 mm. Black, with segments 2 and 3 and sometimes adjoining seg- 

 ments, ferruginous; clypeus, mouth-parts, tegulse, four anterior coxae, and all 

 trochanters, lemon-yellow; upper middle annulus on posterior tibiae and basal 

 portion of tarsi white, rest of tibiae and tarsi piceous to black ; remainder of legs 

 rufous; antennae brown, paler beneath, yellowish in % ; wings subhyaline, ner- 

 vures and stigma brown, pale at base; stigma triangularly lanceolate; head and 

 thorax pilose, face strongly so; in the % type {tibialis) the petiole is piceous and 

 pale rufous on the apical half; the 'J, , as in corresponding species, is smaller. 



Two specimens, Canada and Illinois (type, coll. Amer. Ent. Soc). 



Polyblastus Tarilarsu!« Grav. {Tryphon), Ichn. Europ. ii, 222, 146. 



% 9- — 5-7 mm. Black, with abdominal segments 2-4 rufous; legs rufous 

 (sometimes only the femora), four anterior ones, yellowish; trochanters, four 

 anterior coxae usually, broad annulus on upper tibiae and basal portion of seg- 

 ments of posterior tarsi, white or yellowish white; hind coxae, tibiae and tarsi, 

 black; clypeus. except extreme base, mouth-parts and tegulae yellow or rufous; 

 antennae dark brown, reddish beneath ; wings subhyaline, nervures and stigma 

 brown, pale at base; stigma triangularly lanceolate; pilose, face strongly so; 

 thorax and abdomen punctured. 



Ninety-nine specimens from Montana, Colorado and Nevada. 



PolybIa«itiis leviciilus u. sp. 



% . — 5 mm. Black, with clypeus, month-parts and tegulae, dirty yellowish 

 brown; legs rufous, coxae black, trochanters dusky; antennae short, thickset, 

 black, with small segment between scape and flagellum, yellow; clypeus black 

 at base; wings hyaline, nervures and stigma reddish brown; areolet oblique 



TRANS. AM. ENT. SOC. XXIV. SEPTEMBER, 1897. 



