212 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.55. 



NOMADA CRUCIS Cockerell. 



Female. — Meadow Valley, Mexico (Townsend). 



AGAPOSTEMON TEXANUS Cresson. 



Male. — San Juan Allende, Mexico, 11.29 (Townsend). 



HALICTUS SEMIVIRIDIS Friese. 



Male. — Spanish Point, Bermuda, July 5, 1910 (Eeynold Spaeth). 

 Friese described the female. The male has labrum and apex of 

 clypeus ferruginous ; antennae very long, flagellum dull pale reddish 

 beneath ; tibiae at base and apex, and the tarsi ferruginous. 



MEGACHILE RHODOPUS Cockerell. 



Female.— Mexico (Baker 1785). 



MEGACHILE THORACICA Smith. 



Female. — Buitenzorg, Java, March, 1909 (Bryant and Palmer). 

 This has remarkable clavate hairs, as described by Smith. The 

 hair on the face is only partly black; that surrounding the clypeus 

 is creamy-white, and the lower margin of clypeus is fringed with 

 ferruginous hair. The disk of mesothorax is shining between the 

 punctures. 



MEGACHILE DIMIDIATA Smith. 



Meade-Waldo ^ states that M. velutina Smith is a synonym of dimi- 

 diata. The species is said to have red antennae and fulvous legs, and 

 Meade-Waldo remarks that " the original descriptions of both spe- 

 cies distinctly state that the legs are fulvous." As a matter of fact, 

 the descriptions do not so state, but imply that they are black, with 

 fulvous hair. M. dimidiata is said to have red antennae. M. ery- 

 thropoda Cameron, from Singapore, is also of this immediate alli- 

 ance; it has red legs and the scape is rufous. A female labeled 

 Punjab and United Provinces, India, VI-X (K. L. Woglum), is 

 evidently the genuine M. velutina, described from " northern India." 

 It has black legs and antennae. The insect from Trong, Lower Siam, 

 collected by Dr. W. L. Abbott in 1899, and identified by me as M. 

 velutina, is smaller (length 16 mm.), with brighter red hair, and 

 outer margin of apical half of mandibles much more convex. The 

 antennae are black, but the legs obscurely more or less reddish. This 

 insect represents a distinct subspecies, and may be known as Mega- 

 chile velutina ahhottiana. 



If, as is quite probable, all these insects are to be regarded as 

 subspecies of M. dimidiata, the nomenclature will be : 



MegachUe dimJdiata Smith. 



lAnn. Mag. Hist, November, 1912, vol. 10, p. 468. 



