298 AMERICAN HYMENOPTERA. 



Transition to Middle Sonoran. 

 N. foxii D. T. S. F. ; Eiucoii ; M. V.; Vega S. Jose. T.vp. loc. Denver, Colo. 



Upper and Middle Sonoran. 



N. nevadensis Cress. Albuquerque; La Luz; M. V. 



N. triangulifera ^'acllal. Albuquerque; M. V., flies in Sept., fls. Helianthus. 

 N. nortoni Cress. L. V. ; Eoswell. This and foxii seem not to occupy the same 

 ground, /oxii being more western. 



DIEIINOMIA Ckll. 



D. apacha Cress. "New Mexico." 



D. marginipennis Cress. " New Mexico." 



D. xerophila Ckll. Aztec; M. V.,* flies in Sept., fls. Verbesinn. 



D. mesillse Ckll. M. Y.,® flies in July. 



PROTANDRENA Ckll. 

 Transition to Upper Sonoran. 



p. asclepiadis Ckll. S. F. ■■; Albuquerque. 



Upper Sonoran. 



p. ti'ifoliata Ckll. Albuquerque.* 



Middle Sonoran. 

 p. mexicanorum Ckll. M. V. 

 P. heteromorpha Ckll. M. V.* 



HAL,ICT01DES Nyl. 



Hudsonian Zone. 

 H. maurus Cress. Top of Las Vegas Eange. 



Canadian Zone. 

 H. harveyi Ckll. Harvey's Eanch, Las A'egas Mts.* 

 H. oryx Vier. Beulah. * 



Canadian to Middle Sonoran. 

 H. marg-inatus Cress. Beulah ; S. F. ; Einconada ; M. V. 



Upper Sonoran. 

 H. tinsleyi Ckll. Organ Mts.« 



3 fiddle Sonoran. 

 H. fallugise Ckll. M. V.,® end of April, fls. Falluaia. 



PSEUDOPANITRCIUS Ckll. 

 P. pectidellus Ckll. Organ Mts., '' in Aug., fls. Pectin, in company with Perdito 



soHtaria. 

 P. sethiops Cress. Albuquerque; M. V. Fls. HeliantliKS. 

 P. fraterculus C'kll. Albuquerque; M. V.* Fls. Isocomd. 



