376 Dr. Rob. Lucas: Entomologie. Hymenoptera 1897. 



1. Length over 14 mm; scape witliout yellow . . caesalpiniae Ckll. 

 Length mider 14 mm; scape yellow in front . . . rhodopus Ckll. 



2. Abdomen with narrow haii-bands; clypeus yellowish white 



Hoffmanseggiae Ckll. 

 Abdomen without hair-bands; clypeus lemon yellow lanosa Cr. 



Ceratina amabiUs Cockerell, Trans. Amer.Entom.Soc. Vol. XXIV p. 159 (Mexico). 



nanula Cockerell, Proc. Acad. of Science Philad. 1897 p. 352 (N.- Amerika). 



nautlana Cockerell, Trans. Amer. Eutoni. Soc. Vol. XXIV p. 160 (Mexiko). 



submaiitima Cockerell, Proc. Acad. of Science Pbilad. 1897 p.352(N. Amerika) 

 Coelioxys menthae Cockerell, Canad. Entomol. vol. XXIX p. 120 (N.Mexiko). 



sayi Robertson, Trans, of the Acad. of Science St. Louis vol. VII p. 346 (N. 

 Amerika). 



C 11 e t e s. Cockerell unterscheidet die Colletes-Arten von New Mexiko wie folgt : 



A. Rather large forms of the type of C. inaequalis, with dark, often scarcely 

 banded abdomen in 9- 



(1) No dark hairs on thorax; a sharp straight transverse keel behind the 

 enclosure at base of metathorax. C. utilis n. sp. 



(2) With dark hairs on thorax. 



(a) Tegulae piceous, punctuation very strong and close; wings smoky. 



C. bigeloviae n. sp. 



(b) Tegulae rufe - testaceous, punctuation not so close; wings perfectly 

 clear ; flagellum brown beneath ; stigma rufo-fuscous. C. armata Patten. 



B. Males as large or larger than inaequalis, with black hairs on dorsum of 

 thorax and very large punctures on abdomen. C. güensis n. sp. 



C. Smaller species with well-banded abdomen and withoiit black hairs on thorax, 

 except in a vernal species (C. texana Cr.), 



(1) Distance between eyes and base of niandibles greater than breadth 

 of latter. 



(a) Larger; tips of mandibles biunter; punctuation of first abdominal 

 Segment, stronger and closer. C. Wootoni n. sp. 



(b) Smaller; tips of mandibles sharper; punctuation of first abdominal 

 segment feebler and more sparse. C. daleae n. sp. 



(2) Distance between eyes and base of mandibles less than breadth of 

 latter; much less except in the vernal species. 



(a) Pubescence of the short, the hairs stout, pubescent, moss-like; ab- 

 dominal bands broad and appressed; tips of mandibles blunt. 



C. aberrans n. sp. 



(b) Pubescence of thorax normal. 



(i) Dorsum of thorax with some black hairs; punctuation of first ab- 

 dominal segment excessively sparse. C. texana Cress. 

 (ii) Dorsum of thorax without any black hairs. 



«. Small maleS; with flagellum ferruginous beneath; tarsi ferru- 

 ginous. C. prosopidis n. sp. 



ß. Flagellum dark; tarsi little if at all ferruginous, except in 

 C. Annae. 

 t Punctuation of first abdominal segment feeble and sparse. 



