DIOGMITES. 175 



Face reddish-brown pollinose; bristles of the mystax variable — whitish, yellow, 

 brown, or a mixture of these colours ; front brown ; the occiput black, occipital orbits 

 pale orichalceo-pollinose ; palpi black. Antennae reddish-brown, beset with black hairs ; 

 last joint elongate-lanceolate, about one third longer than the two preceding joints 

 together. Thoracic dorsum on each side with a brownish-yellow pollinose stripe 

 reaching from the humerus to the scutellum ; within and without these stripes there is, 

 on each side, an irregular, somewhat broader, deep velvety-black stripe ; the remaining 

 dorso-central space is of a dull opaque smoky-black, and shows, in the shape of darker 

 black and greyish indistinct stripes, traces of the usual dorso-central stripes. Scutellum 

 and the sides of the metanotum brownish-yellow pollinose ; pleurae velvety- black, with 

 brownish-pollinose reflections. Halteres yellowish-brown. Abdomen slightly coarctate ; 

 segments 1-3 brownish-pollinose, with spots of yellowish pollen in the hind corners ; the 

 posterior half of segment 3 and the remaining segments shining black. Coxae whitish- 

 pollinose, with whitish hairs. Legs chestnut-brown; hind femora, except the base,, 

 darker ; sometimes the other femora and the tibiae are more or less infuscate. Wings 

 with a yolk-yellow tinge in the antero-proximal region ; a brownish-grey shadow fills 

 the following cells : — the marginal, the first submarginal (except a narrow space along 

 the third vein), the second submarginal, the distal half of the first posterior, and the 

 second and third posterior, and forms triangles in the discal and fourth and fifth 

 posterior cells ; the anal and axillary cells are subhyaline, with a slight yellowish tinge, 

 and without shadow, or mere traces of it. Venation normal ; veins reddish. — A male 

 and four females. 



N.B. — The wings of this species resemble those of the Mexican B. nigripes, Bellardi, 

 of which I have seen the type ; but I did not recognize the same species in it ; nor do 

 I recognize it in the description. 



4. Diogmites cuaitlensis. 



Dasypogon (Saropogon) cuaftlensis, Bellardi, Saggio &c. ii. p. 67 \ 



Hah. Mexico, Cua^tla (de Saussure x ) ; Guatemala, San Geronimo {Champion). "4^ *^> 



I have two males and one female from Guatemala, which I have compared with the ~ ' "**"**■ 



types in Turin ; the description also agrees very well. The dorso-central stripe **~^ /*&m^c^ 

 (Bellardi's " macula intermedia ") is very variable in the intensity of the colouring and ^^nw^ 

 the distinctness of the median dividing line. The third joint of the antennae has the- v „ _ 

 usual short bristles on its upperside. As Prof. Bellardi says, this species is very diffi-- "' 



cult to characterize. The types alone would not have satisfied me ; it was the agreement / ' ' 



of the description, which I read later, that convinced me. The usual thoracic stripes of 

 J), cuaftlensis are brown rather than black, the lateral ones often obsolete ; the brownish 

 abdomen has, along the hind margins of the segments, a dull orichalceous reflection ; 

 the wings have a dingy yellowish tinge, upon which the grey shadows are but little 



