592 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 113 
Heleomyza pleuralis (Becker) 
FIGURE 92 
Blepharoptera pleuralis Becker, 1907, p. 3. 
Helomyza pleuralis (Becker), Czerny, 1924, p. 153; 1927a, p. 42. 
Leria pleuralis Coquillett, 1910a, p. 130. New synonymy. 
Amoebaleria pleuralis (Coquillett), Czerny, 1924, p. 132. 
The presence of hairs over the entire mesopleuron (except the 
anterior corner) and the absence of hairs on the pteropleuron dis- 
tinguish this species from all others in the genus Heleomyza. 
Mate AnD FrmMaLe.—Head similar to H. serrata (Linnaeus); 
thorax somewhat darker than H. serrata (Linnaeus) and less evidence 
of mesonotal vittae; mesopleuron pilose except for anterior corner; 
one sternopleural bristle; entire sternopleuron pilose, the hairs becom- 
ing much longer ventrally between the coxae; abdomen ash gray to 
brown, becoming yellowish apically; wings and legs as in H. serrata 
(Linnaeus), except legs are darker. 
Lenectu.—3.0-5.0 mm. 
Distrrrution.—Alaska, British Columbia, New Mexico, Labrador; 
March—August. 
Brotoagy.—I have collected this species in traps baited with 
excrement. 
Remarks.—A single male specimen was sent to me by Dr. Fritz 
Peus, Zoologisches Museum der Humboldt-Universitaét, Berlin, with 
the information that it is the only specimen labelled pleuralis in the 
Becker collection and is possibly the type of this species. It was the 
opinion of Dr. Peus that the labels were in the handwriting of Becker. 
This specimen agreed with the types of Leria pleuralis Coquillett 
(USNM 13099), which I have also examined. This synonymy was 
also recegnized by Steyskal, as indicated by a label accompanying 
Coquillett’s types. 
Abnormal chaetotaxy was observed in several specimens of this 
species. On a specimen from Healy, Alaska, there is 1 small ptero- 
pleural seta on one side and 2 such setae on the other side. Speci- 
mens in the Garrett collection show such variations as an additional 
fronto-orbital bristle on one side, an additional dorsocentral bristle on 
one or both sides, and 1 or 2 small setae between the lateral scutellar 
bristles. 
Heleomyza bisetata (Garrett) 
Figure 93 
Amoebaleria bisetata Garrett, 1922, p. 175.—Czerny, 1927b, p. 39. 
The presence of 2 sternopleural bristles and several setae along the 
middle of the posterior margin of the mesopleuron will distinguish 
this species from others in the genus Heleomyza. 
