242 PROCEEDINGS OF THE NATIONAL MUSEUAI. vol. 41. 



optera are concerned, I fear the Wet Mountain Valley list in the 

 Transactions of the American Entomological Society^ must be con- 

 sidered very unreUable, but the records can be checked with the speci- 

 mens in the National Museum. 



SPECIES FROM ARIZONA. 

 NOMADA TEXANA Cresson. 



Eight males and three females from the Baker collection, labeled 

 Arizona, with Nos. 2122 and 2123. 



NOMADA (XANTHIDIUM) ARIZONICA, new species. 



Male. — Length 9 mm. or rather more; yellow, black, and red, with 

 scanty white pubescence; eyes pale green; facial quadrangle about 

 square; face below antennae all lemon yellow, except that it is slightly 

 suffused with red above, and there is a dusky band down each side of 

 supraclypeal area and halfway down margin of clypeus; lateral face- 

 marks ending broadly but suffusedly a little above level of antennae; 

 a pale red posterior orbital band, extending over top of eye, its lower- 

 most part changing to yellow; labrum yellow; mandibles yellow at 

 base, red in middle, dark at apex; scape stout, bright yellow, with a 

 black band behind; flagellum blackened above, except the first joint, 

 beneath clear ferruginous, with the last three joints dusky; third 

 antennal joint hardly over half length of fourth; mesothorax densely 

 rugosopunctate, black with red lateral suffusion and sublateral bands, 

 the axillae also red; scutellum and postscutellum bright yellow; upper 

 border of pro thorax and tubercles yellow; pleura with a very broad 

 yellow band, having an upward broad extension in front; above and 

 below this band it is red, but black just below the wings; meta thorax 

 broadly black in middle, with a broad red band on each side, invad- 

 ing inclosure, and having on its lower part a large yellow spot; tegulse 

 bright ferruginous; Avings clear hyaline, dusky at apex and in mar- 

 ginal cell; stigma ferruginous, nervures rather light brown; b. n, 

 meeting t. m. ; first r. n. joining second s. m. a little beyond middle; 

 third s. m. very broad below; legs bright ferruginous, with the apical 

 half of anterior femora below, their tibiae in front, spots on coxae and. 

 trochanters, middle and hind femora at apex, yellow, hind femora 

 and tibiae strongly blackened behind; outer side of hind tibiae tuber- 

 culate; abdomen not very broad, bright yellow with the hind mar- 

 gins of the segments reddish, and the extreme bases, as far as the 

 fifth, black; the base of the second is black margined with red, and 

 with a yellow streak on each side at extreme base; first segment con- 

 spicuously narrower than second, red at extreme base, then with a 

 broad black band, edged posteriorly with red, then with an irregular 

 but not broken yellow band, with a posterior subdorsal red emargina- 

 tion on each side, the broad hind margin of the segment dusky, very 



J Vol. 20. 



