OSMIA. — LTTHTTRGUS. 469 



the median segment covered with long soft white pubescence : the 

 legs and sides and apex of the abdomen with s!iorter, more sparse 

 glistening silvery pubescence ; wings hyaline, nervures piceous. 



Hab. Kumaun, N.W. Himalayas {Miss Ada Brook). S • Length 

 10 ; exj). 18 mm. 



Genus LITHURGUS. 



LithurgLis, Latr. Fatn.Nat. du Regm Anim. p. 463 (1825). 



Type, L. comutua, Fabr. 

 Raiif/e. Both hemispheres. 



Head as broad as the thorax ; the inner orbits of the eyes parallel 



or very slightly convergent below ; 

 mandibles narrow, thick, not flat- 

 tened as in Me(/achile, tridentate 

 at apex ; labial palpi 4- jointed ; 

 maxillary palpi 4-jointed ; face be- 

 tween the antennae tuberculate ; 

 vertex rounded, the ocelli placed 

 in a triangle on the front below it : 

 Fig. 155. thorax as in MegachiU ; legs stouter, 



Lifhiirgus atraiiis, 2- ?• generally with longer pubescence in 



the female ; wings exactly as in Megachile ; abdomen broad, flat- 

 tened and depressed above, more convex beneath than in Megachile. 

 The habits of one of the Indian species, L. dmiipes, Smith, are 

 said by Home (Trans, Zool. Soc. vii, p. 175) to be similar to those 

 of Megachile. 



Key to the Species. 



a. Posterior tibiae coarseh' rugose on outer side. . L. afratus, p. 409. 



b. Posterior tibiae Hnely punctured on outer side. L. dentipi'S, p. 470. 



825. Lithur^S atratus, Smith, Cat. i, p. 145, 5 ; Dall. Ton-. Cat. 

 x,p. 415. 



5 . Head and thorax transversely rugose ; abdomen shining, 

 sparsely punctured, the punctures shallow ; clypeus strongl^^ punc- 

 tured, produced into a triangular prominent tubercle at base, 

 arched anteriorly, and fringed with a thick tuft of pubescence ; the 

 posterior tibiaj coarsely rugose above ; the 2ud abdominal segment 

 constricted at base, the apical margins of segments 2-5 narrowly 

 subdepressed. Jet-black ; the apex of the clypeus, the face on 

 both sides the proiiotuin, the sides and apex of the median seg- 

 ment, and base of the abdomen with a thin soft white pubescence ; 

 the legs black with black pubescence ; the apical margins of segments 

 1-5 fringed with whit-e pubescence, on the basal segment this is 

 broadly interrupted in the middle ; the apical segment with black 

 pubescence above ; the pollen-brush thin, from a brownish red to 

 bhick in different specimens ; wings fusco-hyaliue, with a slight 

 purple effulgence. 



Hab. Allahabad; Dehra Dun; Karachi; Bangalore; Ceylon; 

 Burma; Tenasserim. $ . Length 11-13; e.rp. 20-24 mm. 



