Idaho. (L. Bruner.) 
TRIMEROTROPIS. 171 
6. Tr. gracilis, Th. — OEdip. gracilis, Thom. Geol. Surv. of Territ. 1871, 
461 ; Acrid. 121. 
Gracilis, compressa, pallide grisea, nigro-punctulata. — Caput angustum, prominu- 
lum. Costa facialis tota etsi ad frontem sulcata, infra ocellum ad frontemque coarctata. 
—- Pronotum angustum, postice quam caput haud latius; in prozona compresso- 
cristulatum, crista bilobata : metazona pentagonalis, puncetulata, valde carinata, carina 
antice cristulata; processus rectangulus. Lobi laterales parallel. — Elytra pallida, 
sparse nigro-punctata, in dimidio apicali hic illie in venis punctatis. — Alæ dimidio 
basali et margine postico subtilissime flavescente, dimidio apicali et campo antico fere 
toto, hyalinis, venis nigris vel nebulosis ; apice punctis nigris aliquot, margine antico 
ultra medium griseo: venulis transversis areæ mediæ et ulnaris ante medium crasse 
nigris, reticulatione campi postici ultra discum flavum partim nigra. — Variat alis 
in dimidio apicali nebulosis, ad discum flavicantem spurcatis, nec non vitta humerali 
obscura.— Long. © 27, çj 21; El. © 26, G;j' 22 mill.— Amer. boreal.; Colorado, 
7. Tr. pallidipennis, Burm. — OEdip. pallidipennis, Burm. Handb. II, 641, 3; 
Thomas, Acrid. 218. — OEd. straminea, Erichs. ap. Schomburg, Faun. et Flor. 
Brit. Guyan. 582. 
Tr. cinctæ simillima at minor. Elytra valde fusco-fasciata. Costa facialis plus minus 
sinuata, nonnunquara angusta. Tibiæ post. sanguineæ. — Variat fascia fusca alarum 
— a. intus abbreviata. — D. valde angnsta. — Long. © 23-27; Gf 18-21; 
EL © 24-30, «ÿ 19-22 mill. — America central et merid.; Mexico altior. In 
 montibus et silvis pineis prope Tesuitlan in speciem incididi, etiam in regionibus cala- 
dioribus Oaxacæ, Cordobæ reperitur ; in ripis lacus Meztitlani marem cepi elytris brevio- 
ribus, femoribusque intus rubris.— Guyana.—Venezuela. — Ager argentinus 
(Günther). — Patagonia sept. (G. Claraz.). 
Verisimiliter varietas minor Tr. cinctæ. 
S. Tr. cineta, Th. — OEdip. cincta, Thomas, Proc. Acad. Philad. 1870, 80; 
Geol. Surv. of Territ. 1870, 275; Acrid. 122. — ? Tr. vinculata, Scudd. ap. 
21 Rep. Entomol, Commiss. 1880, p. 27. 
Tr. citrinæ statura, formis picturaque simillima ; costa faciali infere minus dila- 
