MACH^EOCEBA. 51 



3. Machserocera magna, sp. n. 



Much larger and more robust than M. mexicana, with the dusky portion of the hind wings occupying little 

 more than the apical half, and, for the most part, due to the infuscation of the veins and cross-veins. 



Head rather broad, the occiput somewhat tumid, and, together with the vertex, rising slightly above the upper 

 edges of the eyes ; vertex broad, flat, the sides straight and meeting in front almost in a point, the 

 side-areas flat, sloping so that they can readily be seen from above ; frontal costa prominent between 

 the insertion of the antennae, the sides parallel and when viewed in profile evenly rounded, below the 

 ocellus gradually widening to the clypeus, sulcate throughout. Pronotum broad, coarsely granulate, the 

 median carina heavy, of equal prominence throughout, cut by the anterior and posterior transverse sulci, 

 the latter placed about the middle. Tegmina broad, with scarcely any indication of maculation. Posterior 

 femora with the outer disc uniformly pale, without transverse bands, save a single median light one 

 interiorly, but with several dark brown dots along the carina which borders this field below. Tibia? 

 infuscated, with a slightly paler basal annulus. 



General colour of the body, legs, and tegmina dull reddish-brown, the latter a trifle paler dorsally. Wings 

 deep transparent blue on the basal half and along the anal edge for some distance towards the apex. In 

 the dusky portion this colouring is due chiefly to the infuscation of the veins and veinlets, although there 

 are also indications of the clouding of the membrane as well, especially interiorly and towards the apex. 



Length of body, $ , 43 ; of pronotum 10, of tegmina 39, width of same 7*15 ; length of hind femora 

 24 millim. 



Hdb. Mexico, " Durango or Sinaloa " (Forrer). 

 One female. 



4. Machaerocera pacifica, sp. n. 



Stouter and somewhat larger than any of the east coast forms, but with the hind wings largely fuliginous. 

 Structure of the head and pronotum similar to that of M. magna, only a trifle more robust in proportion 

 to the size of the insect. Tegmina moderately broad, with the dorsal field lighter coloured, the disc 

 obscurely mottled. Hind femora with obscure indications of light and dark bands externally and the 

 same quite pronounced internally. 



Length of body, 3 22, $ 39 ; of antenna?, S 13, $ 16 ; of pronotum, rf 5'5, $> 7-8 ; of tegmina, d 23, 

 $ 32-34 ; of hind femora, 6 15, $ 21 millim. 



Hah. Mexico, Tepic, on the Pacific slope, not far from San Bias (Gustav Eisen, in 

 coll. Calif. Acad. Sciences). 



Numerous specimens of both sexes. 



5. Machaerocera sumichrasti, Thomas. (Tab. I. figg. 7,7 a, 2 .) 



Machaerocera sumichrasti, Thomas, Bull. U.S. Geol. Surv. Terr. no. 2 (First Series), p. 70 (1874) \ 

 Hab. Mexico, Orizaba (H. H. Smith & Godman), Atoyac in Vera Cruz (Schumann & 

 H. H. Smith), San Eafael in Vera Cruz (Townsend), Jalapa (Godman). 



Thomas's description agrees practically with the form found so plentifully in the 

 vicinity of Orizaba on the Atlantic slope of the eastern cordillera. It is readily 

 separable from M. pacifica by its somewhat shorter and less obscure wings and the 

 other characters given in the synoptic table. 



Hh2 



