48 GEO. H. HORN, M. T). 



D. eoiicolor Newm., Ent. Mag. v, p. 375; Lee, loc. cit. 



Entirely pale yellowish testaceous. Thorax distinctly longer than 

 wide in both sexes, surface smooth, the median longitudinal impres- 

 sion visible at base only. Length .35 — .50 inch ; 9 — 13 mm. 



The fifth ventral of the male is broadly truncate, the sixth feebly 

 notched. The fifth of male is broadly rounded. 



Occurs in Canada and the northern portions of the adjacent States. 



D. eplieinoroides Mium. (Pogonoeerus), Bull. Mosc. 1852, p. 348 ; testaceus 

 Lee, Proc. Acad. 1855, p. 275. 



This species is very like the preceding in form, color and sculpture. 

 The thorax in both sexes is not longer than wide, and the median 

 line is more or less impressed in its entire length. Length .50 — .56 

 inch ; 12.5 — 14 njm. 



The ventral sexual characters are the same as in concolor. 



Occurs from Canada to Washington Territory and Vancouver and 



to Alaska. 



Pyroehroa riiscioollis Mann., Bull. Mosc. 1854, iv, p. 301; Motsch. 

 Schrenks Eeise, p. 143. 



Mr. Otto Lugger, of Baltimore, has given me two 9 specimens of 

 this species collected in Alaska. It was originally described from 

 Kamtschatka, so that its occurrence in Alaska is possible. 



DESCRIPTION OF PLATE III. 



Fig. 1. Lai-va of Glyptus sculptilis as seen from above. 



Fig. 2. The same, lateral view. Fig. 3. Head as seen from the side. 



Fig. 4. Clypeus, mandible and antenna. 



Fig. 5. Meutum and maxilla. Fig. 6. Mandible seen from beneath. 



Fig. 7. Leg of Glyptus larva. 



Fig. 8. Larva of PolyphyUa decemlineatn natural size. 



Fig. 9. Head seen from above. Fig. 10. Head, lateral view. 



Fig. 12, Maxilla, seen from beneath. 



Fig. 13. Mentuni, the lower side. Fig. 14. Mentum, the inner side. 



Fig. 15. Anterior leg. Fig. 16. Posterior leg. 



Fig. 17. Larva of PlatypsyUa castoris, upper view, magnified fifty diameters. 



Fig. 18. View of underside. 



Fig. 19. Underside of head, with mouth parts. 



Fig. 20. Antenna of left side, seen from beneath. 



Fig. 21. Front leg. Fig. 22. Posterior leg. 



Fig. 23. Month parts of Jigialites dehilis ; a, mentum and ligula ; b, maxilla ; c, 



mandible from beneath ; d, mandible, upper side. 

 Fig. 24. Mouth parts of Othnins luguhris ; a, maxilla ; 6, mentum, ligula and 



palpi of 'J) ; c, mandible. 

 Fig. 25. Anillus explanatus Horn. 

 Fig. 26. Trimitomei'tis River sii Horn. 



