NEW AMEKICAN BEES. 149 



5 . Head dark bluish green, thorax a yellower green, quite hairy ; 

 mandibles with the apical half ferruginous, and the basal with a pallid 

 patch ; mouth-parts long for so small a species ; face-marks dull pale 

 yellowish ; clypeus light, except the usual dots ; lateral marks quadrate, 

 somewhat broader than long, not reaching above level of clypeus ; no 

 supraclypeal or dog-ear marks ; flagellum brown beneath, extreme tip 

 almost orange ; wings strongly iridescent ; nervures and margin of 

 stigma sepia ; marginal cell ordinary, the post-stigmatal part about as 

 long as substigmatal ; third discoidal distinct ; legs piceous, small 

 joints of tarsi becoming pallid ; abdomen brown-black, without markings ; 

 venter dark brown ; apical plate ferruginous. 



S- . Smaller, but in general like the female, having the same face- 

 markings ; base of mandibles and flagellum beneath pale ; anterior 

 tibiae wholly light in front. 



Hah. Paris, Texas, August 26th, 1905 ; two females, one 

 male, on plant not determined (F. C. Bishopp). Sent by Mr. 

 Crawford. Also allied to P. ignota. 



Perdita hishoppi, var. (or ignota ?). 



At Handley, Texas, August 3rd, 1905 ; Mr. J. C. Crawford 

 collected two males and two females of a Perdita at flowers of 

 Isopappus divaricatm (Nuttall). One of the females would pass 

 very well for P. ignota, CklL, except that the front is minutely 

 rugulose, and only the second and third abdominal segments 

 have transverse white marks. This specimen also approaches 

 P. vespertilio, in that the face-marks are white, and the flagellum 

 is entirely pale beneath. The lateral marks are reduced to 

 roundish white spots not nearly reaching orbital margin. The 

 nervures and stigma are wholly pale. The female vespertilio has 

 a fine broadly interrupted whitish line at the extreme base of 

 second segment, representing the first white band of ignota and 

 the insect from Isopappus. Comparing the Isopappus female 

 more minutely with the type of bisJioppi, it is seen that the 

 thorax is bluish green instead of yellowish green ; the labial 

 palpi seem not to be quite the same — for instance, the second 

 joint is not over 120 // long, but 150 in hishoppi ; and, more 

 especially, the apical plate of the abdomen is narrowly truncate, 

 the truncation about 45 /^ across, and emarginate, whereas in 

 hishoppi the truncation is quite 80 /^ across, and not at all 

 emarginate. The pollen-grains collected by the Isopapptis female, 

 and those by type hishoppi, look to me exactly the same; globular, 

 spinulose, about 25 fi diameter, appearing white when seen singly. 



So far, the Isopappus insect seems quite distinct from hishoppi; 

 but the other Isopappus female, collected at the same time and 



Mexico, June 27th, 1897. The female vespertilio differs from hishoppi by 

 the white face-marks, the lateral marks somewhat larger and triangular, the 

 flagellum entirely pale beueath, and the pallid taxsi. They are, however, 

 very similar. The lateral marks of female vespertilio are shaped as in the 

 male, but considerably smaller. 



