64 AMERICAN HYMENOPTERA. 



at the comparatively restricted distribution of the larger number. 

 Thus, after collecting for years in New Mexico, J examined Snow's 

 Arizona collection, and found therein a whole series of forms which 

 I had never seen in the former Territory. Then, again, the mate- 

 rial from Southern California, obtained by Davidson, introduces us 

 to still another quite distinct series. Some species range all the 

 way from New Mexico to Los Angeles, but comparatively few. This 

 restricted distribution is probably connected with the fact that many 

 of the species are attached to particular flowers; and it is possible 

 that among these ground-nesting bees the character of the soil may 

 not be wholly unimportant. 



Anthophora, Glisodon and Tetralonia are what might be called 

 palfeoboreal types, probably of boreal origin in ancient times, and 

 now inhabiting both hemispheres. Anthophora, to day, is abund- 

 ant, even in Australia ; and it is curious, as showing the persistence 

 of an apparent trivial character, that certain of the Australian 

 species differ in the clypeal markings just as do our A. smithii and 

 walshii. All the other genera are strictly American, and appar- 

 ently of austral origin. 



In the Eucerine series there is a gradual reduction of the number 

 of joints in the maxillary palpi, from six (Tetralonia) to three 

 (Macroglossapis). Holmberg describes a South American genus 

 said to be a Eucerid, in which these palpi are only two-jointed 

 (Melissoptila). Holmberg's Thygater, with the maxillary palpi 

 three-jointed, may prove not to be separable from Macroglossapis ; 

 in this case the latter name has priority, having been published in 

 1899 (Cat. Abejas de Mexico, p. 14j. From a remark by Mr. 

 Schrottky, I infer that Holmberg's Chacoana is probably a syno- 

 nym of Epicharoides. 



ANTHOPHORA Latr. 



Group A. 



Hind part of thorax covered with very bright red hair ; rest of thorax above with black 



or black and grey mixed. 

 First abdominal segment covered with bright red hair; abdomen witliout tegu- 



mentary bands tricolor Lep. 



Abdomen with creamy or white tegunientary bands at apices of segments. 



krugii Cress. 



Note. — Ji. tricolor is recorded* from Guadalupe and Hayti ; A. 

 krugii from Porto Rico. 



