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SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 62 



sternellar area. Normally the sternellar area is hidden by the coxae 

 except for the two prolongations between the coxae. These are bent 

 dorsally, giving the support for and articulation of the furca. The 



Fig. i8. — Gnathotrichus materiariits Fitch : Metasternum, inner aspect. 



C, coxa; St, sternum; Ti, tibia; Tr, trochanter; a, sternellar area; 6, median line; c, pre- 

 sternellar area; d, clavicula; e, sternal hook of metapleuron; t, head of postepimeron. 



Fig. 19. — Gnathotrichus niateriarins Fitch: Metatergum, inner aspect. 



APh, prephragma; Pc, precosta of postnotum; PN, postnotum; Pph, postphragma; Psc, 

 prescutum; Set. scutum; Sd, scutellum; o, posterior membrane; b, anterior membrane; c, 

 scutellar lobe; d, posterior prealar process; e, anterior apodeme; /, anterior prealar process; 

 g, anterior prescutellar disk; h, posterior prescutellar disk; i, scuto-scutellar suture; /, median 

 apodeme or endodorsum; k, parapsides; /, prealar bridge of postnotum, or postscutellum; ni, 

 prealar hook of postnotum; n, postnotal apodeme; o, scapular hook. 



sculpture of the metasternum is minutely rectangulate. The punctures 

 which occur are sparse, the hairs of medium length and more numer- 

 ous laterally. 



The metathorax shows little specific and no sexual modifications. 



I 



