HYMENOPTERA. 167 



Museum, to all of which the brief description of Fabricius would 

 equally apply ; in order to distiuguish the differences, the fol- 

 lowing additional particulars will be necessary. 



M. mystacea. — Head, thorax, legs and basal segment of the 

 abdomen black, the latter having on its apical margin a band of 

 fulvous pubescence, with which the rest of the abdomen is co- 

 vered ; above the insertion of the antennte, as high as the an- 

 terior stemma, the face is covered with griseous pubescence ; 

 below the antennjE on each side is a little black pubescence ; the 

 clypeus is rounded in front and has a slight notch in the centre ; 

 the mandibles are flat exteriorly and longitudinally grooved to- 

 wards their apex, and covered with elongate punctures, armed 

 at the apex with two teeth ; the spines at the apex of the poste- 

 rior tibiae black. 



The male is coloiu-ed as in the other sex, but the face has a 

 tuft of white pubescence between the antennse, the anterior 

 margin of the cljqjeus has a long beard of the same colom- ; the 

 legs are clothed above with black pubescence. 

 Hub. New Holland ; Cape Upstart ; Port Essington. 



70. Megachile erythropyga, n. s. B.M. 



Female. Length 4i lines. — Black, the face clothed with ful- 

 vous pubescence; the thorax covered with a griseous pubes- 

 cence, very sparing on the disk, Adhere it is somewhat fuscous on 

 and towards the scutellum ; wings fusco-hyahne, nervm-es black ; 

 the tarsi fulvous beneath, the claws rufo-testaceous. Abdomen 

 very convex above, the three basal segments have on each side a 

 short white marginal fringe ; the fifth and sixth segments red, 

 except the extreme base and sides of the former, and clothed 

 with bright fulvous pubescence ; the pollen-brush very pale 

 yellow, the extreme apex fuscous. 



Male. Length 4-4i lines. — Resembling the female in general 

 appearance, the pubescence similar; the abdomen has only a 

 short fringe on the second segment, the fifth segment is covered 

 with bright fulvous-red pubescence, except a narrow portion at 

 the sideSj the sixth segment black, depressed and notched at the 

 apex ; the anterior tarsi are simple, the coxee unarmed. 



Obs. The sexes are united from the cii'cumstance of their 

 having been sent together, and the great general resemblance of 

 the insects. 

 Hab. Western AustraUa. (The female in the Coll. of W. W. 



Savmders, Esq.) 



