58 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I03 



Ba A 2Ax 



Fig. 21. — Details of the metathorax, base of the hind wing, and the lateral 

 metathoracic muscles (drone). 



A, base of hind wing, dorsal view. B, axillary, basalar, and subalar sclerites 

 of hind wing, dorsal view. C, inner face of upper part of right metapleuron, 

 showing pleural articulations of basalare, second axillary, and subalare, and 

 muscles of subalare. D, upper part of right metapleuron and adjoining part 

 of propodeum, anteromesal view. E, lateral part of metanotum, left side. 

 F, lateral muscles of metathorax, right side, mesal view. G, same, with third 

 tergosternal muscle (99) removed. H, same, with notum and first, second, and 

 third tergosternal muscles (97, g8, gg) removed, exposing basalar and subalar 

 muscles {loi, 102, 103) and muscle of third axillary (wo). 



a, nodule of wing membrane giving insertion to muscle of third axillary ; 



b, "ligament" of wing membrane connecting second axillary with subalare; 



c, process of metathoracic endosternal arm (S/h) giving attachment to third 

 tergosternal muscle (gg) ; d, free marginal sclerite of metanotum; e, lobe of d 

 supporting head of first axillary ; /, posterior articular socket of first axillary ; 

 k, anterior inflection of metapleuron ; m, groove between metapleuron and pro- 

 podeum ; fh, semidetached lateral plate of metanotum ; 0, internal ridge between 

 metapleuron and propodeum, r, lobe giving attachment to basalar muscle (,101). 



