414 THE CANADIAN ENTOMOLOGIST 



incomplete, the suture well indicated beneath, the posterior margin 

 of the pleurite produced caudad into a slender point; ventrad of 

 the pleurite is a large, greenish, fleshy lobe; outer pleural ap- 

 pendage pale, rather small, club-shaped, the base constricted, the 

 outer face with long, scattered hairs. What appears to be the 

 gonapophyses of the penis-guard project caudad as two acute 

 chitinized points. Eighth sternite rather large, the caudal margin 

 pale, the median area flattened, transverse, finely fringed with 

 reddish hairs, the lateral angles produced caudad and provided 

 with a few strong, decussate bristles and a few smaller hairs. 

 Female ovipositor with all the valves slender, subequal in length, 

 the tips of the dorsal valves bluntly rounded. 



Habitat. — Alaska. 



Holotype. — cf, head of the Tsirku R., Alaska, July-August, 

 1910. 



Allotype. — 9 , with the type. 

 Tipula flavibasis, new species. 



Size small (wing under 14 mm.) ; antennae of the male 

 elongated, bicolorous, the basal enlargement of each segment 

 yellow, the remainder black; mesonotum yellowish brown without 

 distinct stripes; wings with a strong gray tinge. 



Male. — Length 11.5-12 mm.; wing 12.2-12.7 mm.; antennae 

 about 4.5-5 mm. 



Female. — Length 16 mm.; wing 12.3-13.3 mm. 



Frontal prolongation of the head yellowish brown; nasus not 

 distinct. Palpi with the basal segments brown, pale at the joints, 

 the terminal segments more yellowish. Antennae of the male 

 elongated, the scape dull yellow, the first flagellar segment pale 

 yellowish brown on the basal half, dark brownish black on the 

 apical helf; remaining flagellar segments with the basal swelling 

 yellow, the pedicel black. Head gray, the occiput more yellowish 

 the inner margin of the eyes narrowly pale gray. 



Mesonotum yellowish brown, the usual stripes poorly indicated 

 Pleura yellow with a very sparse white bloom. Halteres pale, the 

 knobs brown. Legs with the coxae and trochanters light yellow, 

 femora yellow, the tips narrowly dark brown; tibiae similar, the 

 tips indistinctly darker; tarsi brownish yellow, the apices of the 

 segments slightly darkened. Wings with a strong gray tinge, the 



