liecorJs vf Bees, (367 



))aiiils ciitiro, tin ir lower i'(lj;es straight; a vci'v br(va(l liaii- 

 baiui, weak in midille, on liist segnjcnt toward the base 

 (//. sisijiiil'i'ii-WkKi character); caudal riina ochrcuus, but 

 uitli black hair on each side. 



Hub. Formosa, 7 ? {Sauier). Berlin Museum. 



Tiiis may be said to represent in Formosa the Chinese 

 H. subopacHS, Smith. In the table above, if the protlioraeic 

 character is ignored, it runs to H. sisymbrii. 



Halictus sidereus, sp. n. 



? . — Length about (» mm., anterior wing 4^. 



Black, with very little iiair, the abdomen without bauds 

 or patches ; head ordinary, broad ; clypeus shiuing, with 

 large punctures ; tlagellum rufescent apieally ; front and 

 vertex minutely punctured, the latter shiuing; mesothora.x 

 and scutellum microscopically tessellate, with scattered 

 small punctures ; parapsidal grooves very distinct ; area of 

 inctathorax poorly defined, with irregular plicue, failing 

 apieally ; posterior truncation not sharp-edged. Legs black, 

 with pale ochreous-tinted hair, the hind tarsi dull ferrugi- 

 nous; hind spur with a few fine sharp teeth; tegulse shining 

 rufo-testaceous. Wings hyaline, very faintly dusky, tho 

 large stigma dark red-brown, nervures sepia, outer nervures 

 moderately weakened ; second s.m. broad, third of the 

 quadrate type; first r. n. joining second t.-c. Abdomen 

 broad, shiuing, very feebly sculptured, the first segment 

 smooth, the second with very minute and indistinct piliferous 

 punctures, the third and fourth microscopically transversely 

 linoolate. 



Hub. Chip Chip, S. Formosa, Feb. 1909 {Sauter). Berlin 

 Museum. 



Kescmbles the Australian H. blackbumi, Ckll., but the 

 latter has a ranch broader head, mesothorax duller and 

 much less evidently punctured, &c. From all other female 

 Halicti of Formosa it is readily known by its small size, 

 dark stigma, and bandless abdomen. On account of the 

 feeble sculpture of the abdomen it cannot be the female of 

 H. lutcitarsellus, Strand. 



Halictus sialia/is, sp. n. 



5 . — Length about 6 mm., anterior wing nearly 4|. 

 Black, with rather abundant but thin pale hair, greyish 

 white below, slightly ochreous above ; head ordinary, clypeus 

 rather produced, rough and hairv ; front dull and granular; 



44* 



