426 ME. E. SAUNDEES ON THE TON&UES OP THE 



the mentum quite at the base instead of about a quarter of its 

 length from it ; the lora are very wide at tlieir bases ; the 

 cardines long and sligbtly curved. 



Stelis, Panz. Krit. Bev. ii. p. 246. 

 Of this I have only dried specimens, but the sclerites all appear 

 to be arranged as in Antliidmm ; but the 2nd joint of the labial 

 palpi is nearly twice as long as the 1st, and the 3rd is widened 

 and somewhat flat, about equal in length to the 4th. 



OsMiA, Panz. Krit. Bev. ii. p. 230. (PI. VII. figs. 4-6.) 

 Labruni elongate, as in the preceding genera, but more 

 rounded at the sides. Scales at the base of the maxillae very 

 strongly developed, subparallel-sided for two-thirds of their 

 length, the outer sides thence rounded to the apex ; inner mar- 

 gins set with long hairs ; maxillary palpi 4-jointed ; blades very 

 long and pointed, with a strong longitudinal rib. Sclerites of 

 the membranous covering of the mentum as in Ccelioxys, &c. ; 

 those of the upper part of the paraglossse longer and narrower ; 

 the lower or blade-like portion of the paraglossse rounded at the 

 apex, and extending to about three-fifths of the length of the 1st 

 joint of the labial palpi. Lingua very elongate ; labial palpi with 

 the 2nd joint once and a half as long as the 1st; apical joints 

 very short ; sclerites connecting the maxillse with the mentum, 

 joining the latter close to its base ; submeutum very long and 

 narrow, widened at the apex ; lora elongate, wide at their bases ; 

 cardines rather narrow and slightly curved. 



Chelostoma, Latr. Gen. Crust, et Ins. iv. p. 161. 

 (PI. VII. figs. 1-3.) 

 Labrum elongate, slightly sinuate at the sides, truncate or 

 slightly emarginate in front. Scales of the maxillae hidden be- 

 neath the labrum. Maxillary palpi 3-jointed ; blades of the 

 maxillae broadly membranous on their inner margin. Sclerites of 

 the upper surface of the mentum as in Ccelioxys, &c. ; those of 

 the paraglossae which were noted in that genus as appa- 

 rently belonging to those organs, here show their connexion 

 most plainly, and appear aa elongate divergent dorsal plates, 

 whereas the rest of the paraglossae, extending below and beyond 

 them, forms a sort of lateral sheath to the base of the lingua, its 

 upper edge being set with bristly hairs. Lingua elongate, linear, 



