162 AMERICAN HYMENOPTERA. 



ANDRENIDJE. 



Agapostenion nasntus Sm. 9 • — Head and thorax bluish green, punc- 

 tuation as in the % ; face broad ; clypeus green, not bent anteriorly as in the % , 

 but with a slight medial depression, apically a transverse yellow band bordered 

 on each side by black, the yellow produced to a point medially at rear; flagellum 

 reddish beneath; tubercles with a yellow spot; legs dark, tarsi ferruginous; 

 front knees and a line down the front of anterior tibiae yellow ; scopa yellowish, 

 black externally; abdomen finely and closely punctured, segment 1 reddish at 

 base; a band of appressed wnite pubescence on bases 2-5; base of first segment 

 with erect light pubescence; other pubescence on abdomen dark; venter ob- 

 scurely ferruginous. Length 10 mm. 



Six $, San Jose, June 25th, on Dahlia; Guapiles, March 7th. 

 Many males, San Jose, March 7, 1902 (M. Gary), June 25th; 

 Guapiles, March 6th and 7th. 



Agapostemoti vulpicolor n. sp. J. — Head and dorsum of thorax 

 deep greenish bronze, clothed with dense bright fulvous pubescence nearly 

 obscuring the surface of the mesonotum ; pleura green ; head closely and coarsely 

 punctured, confluently so below the antennte; antennse dark above, flagellum 

 reddish beneath; mandibles black, tips reddish, a yellow spot at base; clypeus 

 green, anteriorly black (in one specimen a yellow line on the black) ; mesothorax 

 closely and rather finely punctured, with scattered larger punctures; tegulse 

 rufous; wings slightly dusky, more so apically ; nervures dark, stigma medially 

 honey color; base of metathorax coarsely and irregularly rugose, with a trian- 

 gular enclosure, the enclosing lines not reaching anterior part of metathorax; 

 legs dark, apical joints of tarsi ferruginous; pubescence of legs reddish yellow, 

 externally brownish black ; abdomen black, shining, finely and rather sparsely 

 punctured ; segments 2-5 with basal bands of appressed white pubescence, base 

 of first segment with erect light pubescence and a patch of appressed white hair 

 medially on the lateral margins of the segment; pubescence of apical segments 

 black. Length 10 mm. 



Six specimens, Volcana Irazu, February (Carriker) ; San Jose, 

 June 25-26th, on Dahlia. 



This species differs from all others of the genus known to me by 

 the intensity of the bronze color of the head and mesonotum and 

 the great amount of long fulvous pubescence on the thorax. 



Halictus SiidHS Vach. — Punctures of head above antennae about as on 

 mesothorax; face below antennae usually greenish, clypeus mostly black ; hind 

 spur with about four long teeth; abdomen almost olive-green, apical margins of 

 segments narrowly blackish ; length 6-6i mm. 



Except for the color of the abdomen this agrees perfectly with 

 the description given by Vachal and it seems certainly the same. 

 It is a very striking species owing to the blue of the head and 

 thorax contrasting with the abdomen and the confused punctuation 



