AMERICAN HYMENOPTERA. 101 



Agapostemon melliventris, n. sp. 



9 • — Golden-green, very densely punctured, clothed with a pale 

 ochraceous pubescence; anterior margin of clypeus, and mandibles, 

 except tips which are black, yellow ; antennae black, scape at base and 

 beneath pale yellow, flagellum testaceous beneath ; nietathorax coarsely 

 reticulated, sometimes tinged with blue, the truncate apex enclosed by 

 nearly semicircular carina ; tegulae pale yellow ; wings pale yellowish- 

 hyaline, nervines pale, legs yellowish with pale echraceous pubescence, 

 coxae ^d base of femora black, more or less tinged with green ; 

 abdomen ovate, clothed above with a short pale sericeous pile, very 

 dense at base of the segments, the fourth segment has a narrow black 

 band across the middle and the following segments more or less tinged 

 with black; beneath, the apical segments are more or less blackish. 

 Length 42 lines. 



Three specimens. Easily recognized by the green head and thorax 

 and the fulvous abdomen. 

 Halietiis trizonatus, n. sp. 



9- — Black; finely, not densely punctured, clothed with a pale 

 griyeous pubescence, more dense on face, cheeks, sides of thorax, 

 postscutellum and sides of metathorax ; scutellum shining; enclosed 

 space at base of metathorax finely, longitudinally rugose; tegulae brown < 

 wings hyaline, tinged with yellow, veins honey-yellow, subcostal nerve 

 black; legs black, with short dense griseons pubescence; abdomen 

 rather short ovate, convex, smooth and shining, base and sides with 

 a long thin griseous pubescence, base of second, third and fourth 

 segments each with a broad band of short dense white pubescence; 

 anal rima fulvous. Length 4j lines. 



One specimen. Collected in Nevada by Dr. H. C. Yarrow. 

 Noinia iievadensis, n. sp. 



9 .—Head and thorax black, rather densely clothed with a short 

 ochraceous pubescence; three or four basal joints of antennae and 

 sometimes the middle of face and clypeus, fulvous; scutellum and 

 metathorax fulvo-ferruginous; on side of thorax the pubescence is 

 long and dense, and short and dense on anterior part of mesothorax, 

 on posterior margin and on postscutellum ; basal space of metathorax 

 enclosed by a well defined carina, and longitudinally rugose; tegulaj 

 pale honey-yellow; wings yellowish, with apical margin broadly fuligi- 

 nous; legs fulvous, with dense ochraceous pubescence; abdomen ful- 

 vous, apical margin of the segments depressed, pale, and fringed witli 

 ochraceous pubescence; venter fringed with long ochraceous pubes- 

 cence. Length Si lines. 



