4F Canadian Arctic Expedition, 1913-18 



Chiloxanthus stellata Curtis. 



This large saldid seems to be common in Arctic America. Mr. Johansen 

 look adults at Demarcat ion point, Alaska, May 16, 1914; west of Kongenevik, 

 Camden bay. Alaska, July 4, 1914, about the margins of a tundra pond; at 

 Bernard harbour, Northwest Territories, July 15, 1915, and August 4 and 25, 

 1 ( .H.">; and the young at Collinson point, Alaska, September 13, 1913; Collinson 

 point. Alaska, .June 2.">, 1914; and Bernard harbour, Northwest Territories, 

 .bine 20, H)l(>. The Philadelphia Academy of Sciences possesses a good series 

 taken near the mouth of the Mackenzie river. 



Calacanthia trybomi J. Sahlberg. 



Collinson point, Alaska, six adults taken June 23, 1914, and one young, 

 apparently of this species, taken at Bernard harbour, Northwest Territories, 

 July 19, 1915. These adults agree in all respects with the descriptions of 

 tri/hon// by Sahlberg and Reuter and there can hardly be a question of their 

 identity. It is its first-recorded occurrence in North America. 



Arctocorixa sp. 



Two examples taken from a tundra pond at Teller, Alaska, August 6, 1913. 

 Euscelis hyperboreus n. sp. 



Related to extrusus Van D. and alpinus Ball, but smaller and narrower than 

 either; pale markings on the vertex forming an angled line at apex, a transverse 

 line between the ocelli, and two quadrate spots occupying the base; fuscous 

 margins of the elytral nervures composed of segregated irrorations. Length, 

 \-\\2 mm. 



Vertex quite strongly produced, forming a right angle in the female, its 

 median length one half the basal width, the length next the eye two-thirds that 

 on the median line; in the male distinctly shorter; passage to the front well 

 rounded. Front broad and short, the sides slightly incurved to the base of the 

 clypeus. Clypeus broad, oblong, the sides rectilinear and scarcely approaching 

 at apex. Lorae broad, almost reaching the margins of the cheeks below. Prorio- 

 tum one-fourth longer than the vertex in the female; nearly a half longer in the 

 male. Elytra short, scarcely surpassing the abdomen in the male; attaining 

 the middle of the fifth tergal segment in the female; the costa strongly arcuate 

 with the apex rounded. 



Valve of the male as long as the ultimate ventral segment, triangular; 

 plates broad, truncate at apex, together almost quadrangular, their margins 

 with a few stiff bristles. Styles but little surpassing the plates, attaining the 

 apex of the anal tube. Last ventral segment of the female short, broadly 

 excavated; pygofers broad, triangularly narrowed beyond the apex of the last 

 ventral segment . 



( 'olour yellowish testaceous becoming paler beneath and a little tinged with 

 fulvous on the abdomen. Vertex fuscous before an arcuated line either side on 

 the anterior margin from the tip to the ocelli; a transverse line across the surface 

 between the ocelli, and the disk posteriorly pale, the latter divided into two 

 quadrate spots by the fuscous median line. Face fuscous, median line and lateral 

 arcs of the front, sides of the clypeus and disk of the lora? and cheeks pale. 

 Pronotum dusky posteriorly, the anterior submargin marked with a concentric 

 row of about ten dark points. Scutellum with the margins pale and calloused 

 on the basal one-half and the basal angles more or less marked with pale. 

 Elytral nervures pale, mostly margined with lines composed of fuscous irrora- 

 tions. Legs pale, varied with fuscous, the anterior and intermediate femora 



