44 DIPTEKA. 



black, erect hair ; a more or less distinct brownish flesh-coloured stripe in the middle, 

 longitudinally bisected by a brown line ; the stripe does not reach the scutellum, and is 

 sometimes very indistinct ; some white hairs on the humeri ; the dark-brown pleurae and 

 pectus are clothed with long black hairs ; tufts of similar hairs above the root of the 

 wings on the post-alar callus ; the scutellum in some specimens is reddish. Abdomen 

 brown on the three first segments, with an appressed black pubescence ; segments 4-6 

 above and below clothed with dense, bright rufous hair ; a tuft of white hair at each end 

 of the posterior margin of the second segment ; some white hair on the corresponding 

 portion of the venter. Coxae and femora dark brown, beset with black hair ; tibiae and 

 tarsi pale whitish-yellow ; the tarsi with brown tips. Wings dark brown between the 

 costa and the fifth vein, before the central cross-veins ; the rest of the surface tinged 

 with pale brownish, which becomes yellower near the costa ; first posterior cell open, 

 although coarctate ; the fourth cell broadly open ; the second submarginal cell is not 

 appendiculate in two of my specimens, it bears a short stump on one of the wings of 

 the third specimen. Three females. 



N.B. — This species shows the most remarkable resemblance to P. rhinophora, Bellardi. 

 Still the latter has distinct tufts of white hair in the middle of the abdominal segments, 

 no rufous hair on the fourth segment, and no vestige of a longitudinal stripe on the 

 thorax. The shape of the head, antennae, and palpi, and the general colouring (with 

 the above-mentioned exceptions) are the same. I did not have specimens of P. pyrausta 

 with me when I visited Turin, and could not, for this reason, undertake a closer com- 

 parison. 



P. analis, Fabr., must be something like P. pyramta ; but the " antennae ferrugineae, 

 alee albae, &c," render the identification impossible. 



2. Pangonia caustica, sp. n., 6 . 



Eyes glabrous ; ocelli distinct ; first posterior cell closed ; face retreating ; proboscis about as long as the head 

 is high. Thorax brown. Abdomen reddish-brown, black at the base ; femora black, the tibiae rufous. 

 Wings with a pale brownish tinge, dark brown at the base. 



Length about 18 millim. ; length of proboscis 3-5 millim. 



Hal. Mexico, Ciudad in Durango 8000 feet (Forrer). 



Male. Face strongly retreating, brownish -grey with black pile. Antennae ferruginous ; 

 basal joints with black pile ; third joint with a rounded projection at the base, abruptly 

 attenuated beyond it, and very slender towards the tip. Palpi dark brown, with black 

 pile. Thorax uniformly brown, beset everywhere with black pile ; tufts of whitish hairs 

 under the root of the wings ; mesonotum with almost imperceptible traces of greyish 

 lines. Abdomen reddish-brown, clothed with black pile, the first segment darker brown or 

 black ; an ill-defined inverted blackish triangle occupies the middle of the second seg- 

 ment ; a similar infuscation, in the shape of an ill-defined stripe, on the next following 

 segments, up to the fifth. Femora black ; tibiae and tarsi rufous, the tips of the latter 



