334 T. D. A. COCKERELL. 



Lithurgus dubius (Sicbel). 



The Chilian Megachile dubia Sichel is a Lithurgus, as Vachal has 

 pointed out. It has the curious pale grey and black pubescence 

 characteristic of several other Chilian bees {Megachile chilensis and 

 gasperinii, Tetralonia atrifrons). Both sexes are in the Museum, 

 bearing a manuscript name by Philippi, which indicates it as the 

 long-tongued inhabitant of the mountains. The insect is very 

 large and stout, 19-21 mm long; scopa black; pubescence pale 

 grey above, black at sides, on face, beneath, and on apex of abdo- 

 men above. The sexes are easily distinguished thus : 



% . — Rather larger and broader, but bead not so large and broad ; face normal, 

 densely covered with erect black hair End of abdomen densely 

 covered with black hair; apical plate narrow, finger-shaped, concave 

 above; hind femora much swollen; mandibles strongly 3-dentate at 

 apex. Maxillary palpi apparently 3-jointed. 



2- — Rather smaller and narrower, but head larger and rounder; face with a 

 very large and prominent punctured transverse ridge just below the 

 antennas. Mandibles tridentate, but the third tooth is easily over- 

 looked, and Sichel erroneously described them as bidentate. 



My statements regarding the maxillary palpi of L. dubius and 

 rubrieatus must be taken with some reservation, as it was not possi- 

 ble to see them very well. 



There is a small character of the venation which may be of some 

 use in dividing the genus Lithurgus, as follows: 



(1) Second r. n. joining second s m. well before its end. L. cognatus Sni. (Aus- 



tralia), L. dubius (Sich.), L. gibbomis Srn., L. apicalis Cress., L. rufipes 

 Sm., L. collaris Sm. 



(2) Second r. n. joining second s. m. at end, but not quite meeting t. c. L. denti- 



pes Sm., L. atratus Sm. 



(3) Second r. n. meeting t. c. L. comutus (Fab.). 



DIOXYS Lepel. 

 The Algerian D. rufiventris Lep. is covered with deep fox-red 

 hair, and is not at all like our American insects in color or form. 

 It has the scutellar spine, however. D. cincta (Jurine), from Corfu, 

 resembles our species. 



EIJASPIS Gerst. 



Friese and Vachal sink Parevaspis as a synonym of this genus. 



Comparing Euaspis abdominalis (Fab.) with Parevaspis abdomina- 



lis (Sm.), the former is a larger and broader bee; however with the 



same sort of scutellum, which in E. abdominalis is deeply emargi 



