AMERICAN HYMENOPTERA. 295 



faint. In the Texas specimens the lighter markings of the second 

 segment are larger and quadrate. 



One individual from Austin, Texas, exhibits but a single tooth at 

 the middle of the mandibles; and this in view of its similar habitus, 

 would lead one to search for it among the species of the group 

 anthophorce. The lengthened pedicle and first flagellar joints, the 

 carinse of the lower occiput, the crenulate sides to the metathorax, 

 the strigose metapleurse, and the sharp, uniform ventral keel, how- 

 ever, are all characters distinctive enough of simillima to show the 

 relationship of the Austin specimen to that species. 



11. Mill ilia propinqua Cress. (19). 



Nebraska, Texas (M. C. Z.), Mesilla Valley, New Mexico 

 (Cockerell). 



12. nutilla oceola Blake (20). 



Several males were taken at Wood's Hole, Mass., during August 

 of last summer, by Mr. Brues. They may possibly be the male of 

 harmonia Fox, but they seem to belong to this species. The punc- 

 tuation of the second abdominal segment is uniform and rather 

 close, the size of the insect is larger and the wings appear to be 

 shorter than in oceola. 



13. Mill ilia Sanbornii Blake (21). 



The Museum of Comparative Zoology at Cambridge contains a 

 specimen of this species without locality label. 



Group waco. 



14. n ill ilia waco Blake (25). 



Plate IV, fig. 3; petiole. 

 Not rare. Austin and Fedor, Texas. 



15. yi ill ilia harmonia Fox (26). 



Plate IV, fig. 4 ; petiole. 



This species closely resembles M. cypris in color. It measures 

 twelve mm. in length. Several specimens were taken at Woods 

 Hole, Mass., during different seasons. Not rare on the sand dunes 

 at Porter, Indiana. The species is not related to waco. 



TRANS. AM. KNT. SOC. XXIX. SEPTEMBER. 1903 



