THE CANADIAN ENTOMOLOGIST 277 



Pupa. — ^Length 7 mm. Width across wing-cases 3 mm. Whitisii, sub- 

 oval, rounded anteriorly, gradually tapering posteriorly. Head, thorax and 

 ventral surface sparsely hairy. Dorsal surface bears a number of fine, minute 

 hairs. Hairs on anterior and lateral thoracic margins long and fine. Lateral 

 body hairs longest. Sides of abdominal segments two to five produced into 

 somewhat flat, plate- like, subrectangular, expanded tubercles. Anterior and 

 posterior transverse edges of each expansion or tubercle chitinized and serratu- 

 late, the distal corner ending in a minute spine. Lateral edge of expansion 

 bears a minute, median spine with a long hair arising from below the tip. The 

 lateral expansion on the first abdominal segment has a heavily chitinized posterior 

 edge, a minute, median, lateral spine but the anterior edge is not chitinized 

 nor serratulate. Lateral expansion on sixth abdominal segment is smaller 

 than the others and lacks the posterior edge. Last abdominal segment termin- 

 ated at each edge by a comparatively prominent, pointed spine. 



Adult. — Platydema ellipticum. This was described by Fabricius in 1801 

 (Syst. Eleut., H, 1801, 566). The beetle is elongate-oval, about 6 mm. long, 

 black, each elytron having an oblique irregular reddish spot extending from 

 the humerus to the suture. The thorax is finely and sparsely punctate, the 

 elytra finely striate and the striae with fine, distant punctures. It is generally 

 distributed throughout New Jersey and occurs according to Smith (Insects of 

 N.J., N.J. St. Mus. Rept. 1909) under the bark of fungus- covered trees. 

 Blatchley (Coleoptera of Indiana) states that it is frequent in the southern half 

 of Indiana beneath bark on fungus covered logs. Up to the present time this 

 species has been found associated only M^ith Polyporus gilvus in New Jersey, 

 but it is extremely probable that it breeds in other woody fungi also. 



A NEW ANTHOMYIID FROM LABRADOR (DIPTERA). 



BY J. R. MALLOCH, URBANA, ILL. 



The species described herein I have placed in the genus Helina Robineau 

 Desvoidy {Aricia auct.) with some hesitation. The genus is, however, de- 

 cidedly composite and pending a satisfactory subdivision of it the present 

 arrangement is the best available. Stein in all his more recent papers on Antho- 

 myiida^ uses the name Mydcea for this genus, but that name is, as I have pointed 

 out in several of my papers, properly applicable to the small group of which 

 pagana Fabricius is the type. 



Helina tuberculata, sp. n. 



Male. — Black, shining, with conspicuous gray pruinescence. Head entirely 

 black. Thorax with 4 broad, black vittae. Abdomen with a pair of large, ill- 

 defined, subtriangular black spots on second and another on third segment. 

 Legs black. Wings slightly brownish, more distinctly so along the courses of 

 veins, yellowish basally. Calyptra? and halteres orange yellow. 



Eyes distinctly hairv', separated by about width across posterior ocelli; 

 parafacial at base of antenna at least as wide as third antennal joint at apex, 

 not narrowed below; third antennal joint broadened apically, second with 

 several long bristles above; arista short pubescent. Thorax with or without a 

 pair of long presutural acrostichals; prealar bristle at least half as long as the 

 bristle behind it; postsutural dorso-centrals 4; hypopleura bare; sternopleurals 

 1:2; scutellum bare below' and on sides. Abdomen ovate; first stern ite bare; 



December, 1919 



