1910.] NATURAL SCIENCES OF PHILADELPHIA. 369 



scutolluin dullish, yellowish-green, with slighl crimson tints, very 

 finely but not extremely densely punctured; dorsum of thorax with 

 thin brownish-tinted hair: area of metathorax semilunar, well- 

 defined, with regular straight plicae, on the basal half connected by 

 minute cross-ridges; posterior truncation very hairy; legs black, not 

 metallic, last joint of tarsi red; hair of legs black on outer side; hind 

 femora slender, arched beneath, with a long curled pale scopa; inner 

 side of tarsi with light ferruginous hair; hind spur with very long 

 spines; teguhv fuscous with a ferruginous spot; wings strongly dusky, 

 stigma rufofuscous, nervures fuscous, outer r. n. and t. c. much weak- 

 ened; second and third s. m. cells about equal, and together not as 

 large as first; first r. n. joining third s. m. near base, third discoidal 

 cell narrowed above; abdomen broad, shining, impunctate, obscurely 

 bluish-green, hair at apex reddish, caudal plate narrow, exposed, 

 venter with a scopa of long white hairs. 



Hah. — Tanna Island, Xew Hebrides, June, 1900 (J. J. Walker; 

 Brit. Museum). Allied to H. perpessicus Kohl, from Samoa, but 

 easily distinguished by the longer, more oval head. Also allied to 

 H. saffordi Ckll., from Guam, but the area of metathorax is quite 

 different. 

 Halictus epiensis sp. n. 



9. Length a little over 6.5 mm.; superficially and structurally 

 like H. to nnaensis, but easily distinguished by the following character- : 

 mesothorax and scutellum narrower, more closely punctured, rich 

 blue-green; area of metathorax larger, more finely sculptured, the 

 very delicate rugae joined by cross-rugse, producing a fine reticulation, 

 while apically delicate striae pass obliquely to each side of a fine 

 median plica; wings very dark (venation as in H. tannaensis). The 

 third antennal joint is very short, broader than long, a little shorter 

 than the second or fourth. 



Hab.— Ringdove Bay, Epi Island, Xew Hebrides, July 21. 1900. 

 (J. J. Walker; Brit. Museum.) 



Halictus pachycephalia sp. n. 



o 71 . Length about 6 mm., rather robust, with very large broad 

 head (wider than thorax) and short abdomen; black, with dull whit.' 

 hair, the legs ferruginous, the coxae, trochanters, and basal half < it- 

 more of femora black, anterior femora black behind except at extreme 

 apex; spurs pale ferruginous. Head about 2.17 mm. wide; mandi- 

 bles pale yellow with the apex broadly black; labrum pallid; clypeus 

 with a pale yellow apical band, broad in middle; white hair of fai 



