COCKERELL— HYMENOPTERA, APOIDEA 39 



Subfamily Osmiinae. 

 Heriades Spinola. 



11. Heriades aldahranus, sp. nov. 



$. Length 5^ — 6 mm. ; black, moderately robust, with the usual scanty white hair 

 abdomen with extremely narrow but distinct white hair-bands on all the segments ; 

 ventral scopa white. A very ordinary little species, closely related to the European 

 H. truncorutn and the American H. carinatus, differing only as follows : general form 

 rather more compact, the abdomen rather short ; clypeus with a pair of strong nodules 

 on its lower margin, these about 255 /a apart (not contiguous as in truncoruni) ; mandibles 

 about as in carinatus (much shorter than in truncorum), slightly reddish apically ; eyes 

 distinctly converging below (like carinatus, not like trimcorum) ; clypeus and supraclypeal 

 area dull, minutely densely granular-punctate ; veitex moderate, distance from top of eye 

 to occiput about equal to distance to lateral ocellus (in truncorum especially the vertex is 

 much broader) ; diameter of cheeks less than diameter of eye (greater in truncorum) ; 

 mesothorax and scutellum shining, but entirely covered with large punctures, which have 

 a diameter of about 70 /a (in trvMCorum the sculpture is similar, but somewhat finer) ; the 

 metathorax and base of abdomen offer nothing peculiar, except that the margin of the 

 abdominal basin is practically straight (strongly concave in truncorum) ; legs quite 

 ordinary (as in truncorum), the hind basitarsus more than half the width of the tibia ; 

 wings as in carinatus, with the same venation, but not quite so dusky (considerably 

 darker in truncorum) ; sculptiu'e of abdomen essentially as in truncorum, but segments 

 4 to 6 about equally (not densely) clothed with short appressed white hair. The face has 

 finely plumose white hair at the sides, but is not densely covered as it is in //. argetitatus 

 Gerst. The pleura is thinly clothed with white hair. 



Locality. Aldabra, September 1908, 2 ? (./. C. F. Fryer). One is labelled "swept 

 from flowers." One of the specimens has a parasitic mite upon the thorax. 



Subfamily Megachilinse. 

 Megachile Latreille. 



12. Megachile disjuncta (Fabricius). 



Apis disjuncta Fabricius, Sp. Insect. I, p. 481 (1781). 



Localif)/. Mahe, Seychelles (//. Scott). One is from near Morne Blanc, 1908 ; another 

 from Long Island, July 1908. 



13. Megachile rujiventris Guerin. 



Megachile rvfirentris Guerin; Belanger, Voy. Ind. Orient., p. 502 (1834). 



Localities. Mahd, Seychelles, two females, one from Long Island, July 1908 {H. Scott) ; 

 F^licite Island, December 1909 (//. Scott). Thissjjecies has been reported as M. mystacca 

 (Cameron, Trans. Linn. Soc. Lond. xii. 1907, p. 70), but that Australian species is cortaiiily 

 distinct, as F. Smith long ago pointed out. 



