NO. 10 



MORPHOLOGY OF GNATHOTRICHUS — SCHEDL 



47 



the heavily chitinized wall of the coxa which is covered by a thin 

 membrane only. The extreme tip of the trochantinal condyle touches 

 this. Ridges to strengthen the coxal walls do not occur in the fore- 

 and mesocoxa. The metacoxa bears such a ridge on the ventral side 



Fig. 26. — Gnathotrichus materiariiis Fitch: A, fore leg, B, mesothoracic leg, 



C, metathoracic leg. 



F, femur; Ptar, pretarsus; Tar, tarsus; 7V. tibia; Tr. trochanter; a, trochantero-femoral 

 joint; b, basicostal ridge; c, condyle of trochanter; rf, dorsal femoral fossa; e, ventral 

 femoral_ fossa; /, anterior groove; g, tibial condyle; /(, outer margin of tibia; i, marginal 

 tooth; j, apical tooth; k, I, m, n, tarsal segments; o. apical segment; q, arolium; />, claw. 



which forms a well developed internal ridge (e) ; this ridge may 

 correspond to the anterior coxal suture (Snodgrass). Another more 

 feebly developed ridge (f) occurs on the dorsal coxal wall. 



The hair armature is best explained by the figures. No dififerences 

 have been found from species to species. 



