134 



genitalia can be examined. The genns is nearer Tlylaeus than 

 to Gnatlwprosopis but seems sufficiently distinct from either. 

 The propodenm, supraclypeal area and other characters are 

 appai-entlv as in IIi/](ieus. Type the following species. 



Gnathylaeus Williamsi n. sp. 



9 Black ; heavy inverted T-shaped mark on clypeus. sides of face 

 to antennae and from there narrowed to the orbits, collar interrupted 

 medially, tubercles, basal internal spot on tegulae, external basal stripe 

 on anterior and middle tibiae and basal half of hind tibiae sulfur yel- 

 low ; calcaria whitish, apex of mandibles, flagellum beneath and tarsi 

 brownish ; wings hyaline, neuration of front wings blackish, of hind 

 wings pale. 



Surface of propodeum except the basal area somewhat concealed by 

 fine scattered cinereous appressed pubescence, hind margins of first 

 tergite with a widely interrupted white hair band, second and third 

 tergites with similar hair bands, evident only in certain lights. 



Clypeus longitudinally microscopically lineolate and with rather coarse 

 well-separated punctures. Front and vertex closely and confluently 

 punctured. Mesonotum much the same, punctures of scutellum well sep- 

 arated, metanotum shagreened, area of propodeum rugose-shagreened, 

 mesopleura much as the mesonotum. 



Abdomen with tergite i highly polished and shining with a few 

 shallow minute scattered punctures, second and following tergites less 

 shining with minute shallow punctures distant from each other two or 

 three times their diameters; tergites 1-3 but very little contracted; ster- 

 nites a little more coarsely punctured. 



Length about 6 mm. ; wing 4.5 mm. 



Described from two $ collected at Los Banos, Luzon, 

 Philippine Islands (F. X. Williams). 



Type and paratype in the author's collection. 



IT. Xesopkosopis Perkins. 



Dr. Perkins has described a species from China as Neso- 

 ■prosopis cliinensis. I have a male which is strictly congeneric 

 with this from the Philippine Islands and I am convinced that 

 these species should be separated from Nesoprosopis. This and 

 the new species are referred to a subgenus of Hylaeus which I 

 call Nesylaeus, since I can find no character to separate these 

 species from Hylaeus except the male genitalia. 



