982 PROCEEDINGS OF THE NATIONAL MUSEUM VOL, 118 
sternopleuron is without setae; thorax otherwise similar to A. flavo- 
testacea (Zetterstedt); legs yellow, becoming darkened at ends of 
tarsi; 2 or 3 bristles on distal anterodorsal surface of hind femur; 
wings hyaline with faint yellowish or brownish tinge; abdomen 
grayish yellow. 
Lrenetu.—4.5—5.0 mm. 
DistripuTION.—British Columbia, Washington, Idaho, Wyoming, 
Colorado; June, August, October. 
Amoebaleria perplexa Garrett 
Ficure 79 
Amoebaleria perplexus Garrett, 1924, p. 27. 
Amoebaleria perplexa Garrett, Czerny, 1927, p. 39. 
The male of this species is very similar to Amoebaleria triangulata 
Garrett, except as follows: third antennal segment brownish; eye 
relatively small, the cheek-eye ratio from 0.70 to 0.75; buccal setae 
in 2 irregular rows; dorsocentral bristles becoming weaker anteriorly; 
mesonotal setae rather long, especially toward the anterior portion; 
sternopleural setae covering all but the anterior corner and a narrow 
strip along the posterior margin; hind femur with no strong bristles 
on anterodorsal side. 
The male terminalia of A. triangulata Garrett and A. perplexa 
Garrett will distinguish one species from the other. 
I have examined the type male and a male paratype in the Garrett 
collection. Two males in the U.S. National Museum are each ac- 
companied by a female with the same collection data. The female 
is similar to the male, but the dorsocentral bristles are not weakened 
anteriorly and the mesonotal setae are short. 
Lreneto.—6.0 mm. 
Distrispution.—Alaska, British Columbia; July-August. 
Amoebaleria helvola (Loew) 
FIGurE 81 
Scoliocentra helvola Loew, 1862a, p. 223 (Centuria 2, 80).—Czerny, 1924, p. 141. 
Leria helvola (Loew), Aldrich and Darlington, 1908, p. 83. 
Leria helvola var. angusitfrons Banks, 1926, p. 43. 
Scoliocentra helvola var. angustifrons (Banks), Czerny, 1928, p. 53. 
The yellow color of the entire body, the large size, and the presence 
of brownish clouding (sometimes very faint) along the posterior 
crossvein and ends of the longitudinal veins will distinguish this 
species from others in the genus. 
MALE AND FEMALE.—Head yellow to yellowish orange, darker 
above; arista dark brown, anterior fronto-orbital bristle about one- 
