692 MOSQUITOES OF NORTH AMERICA 



scales, a narrow median black line and a narrow line of creamy scales on each side, 

 also a few creamy scales in front, over the root of the wings and before the scu- 

 tellum; four rows of long dark bristles on the posterior half of the mesonotum; 

 scutellum brown with narrow curved pale creamy scales and long dark posterior 

 border bristles ; metanotum pale brown; pleura fawn coloured, densely-white scaled. 



Abdomen deep blackish-brown with basal white bands and a few yellow scales on 

 the apices of the last three segments; border bristles pallid; venter densely clothed 

 with creamy-white scales. Legs with the coxae pale, with creamy scales; femora pale 

 basally and ventrally, with scattered brown scales becoming densest towards the 

 apex, extreme apex with a yellow spot; tibiae brown, mottled with pale scales, 

 darkest towards the apex and with black bristles; fore metatarsi and first two tarsal 

 segments with narrow pale basal bands; mid-tarsi the same as the fore; hind legs 

 with a pale basal band to the metatarsi and first three tarsal segments, last segment 

 black; all the ungues uniserrated. 



Wings with brown scales except on the subcostal vein and one side of the first long 

 vein, where they are mainly white, and also at the base of the costa; the lateral vein- 

 scales on the second, third, fourth and apex of the fifth veins long; the first, third 

 and fifth long veins with darker scales than the remainder; fork-cells short, the first 

 submarginal cell longer and narrower than the second posterior cell, its base about 

 level with that of the latter, its stem slightly longer than half the length of the cell; 

 stem of the second posterior about the same length as the cell; posterior cross-vein 

 rather more than its own length distant from the mid cross-vein; fringe dense, 

 brown. Halteres with pale testaceous stem and fuscous knot. 



Length. — 4.2 to 5.5 mm. 



(?. — Palpi brown with a white band at the base of the two apical joints, plume- 

 hairs brown, yellow opposite the pale basal areas, there is also a pale band on the 

 long antepenultimate joint, the last two joints of nearly equal length, the apical one 

 slightly the shorter; apex of the antepenultimate swollen. Antennae with brown 

 plume hairs tipped with grayish yellow; scales of the head gray. Thorax with looser, 

 more scattered, reddish-brown scales in the middle, gray ones at the sides. Abdomen 

 as in the $. Legs banded as in the $, but the pale basal bands more of a yellow hue. 



Fork-cells very small; first submarginal a little longer and much narrower than 

 the second posterior, its base a little the nearer the apex of the wing, its stem a little 

 longer than the cell; stem of the second posterior cell also longer than the cell; 

 posterior cross-vein about one and a half times its own length distant from the mid. 



Fore and mid ungues unequal, both uniserrated, the larger mid ungues rather 

 stralghter than the much-curved fore one; hind ungues equal, prominently uni- 

 serrated. Basal lobes of genitalia very hairy, claspers narrow, thin, terminating in 

 a longish spine. 



Length. — 4.5 to 5 mm. 



BaMtat. — Pecos Canon, New Mexico, U. S. A. 



Time of capture. — June 16th to 29th. 



Observations. — A very abundant species, according to Dr. Grabham, caught after 

 sunset. It varies very much in size, the smallest specimen being 4 mm., the largest 

 5.5 mm. The c? has evidently a variable adornment on the thorax and is peculiar in 

 having the hind ungues uniserrated. 



The species can easily be told from any other Orabhamia with banded legs by the 

 basally-banded abdomen and last hind tarsal being black and the white-scaled sub- 

 costal and first long vein. O. dorsalis, which it most nearly approaches, has the 

 abdomen and thorax with different adornment and the legs basally and apically 

 banded, not basally as in this species. The type is in the British Museum (Nat. 

 Hist). 



The larva. — Head deep chestnut brown, eyes black, reniform, pale around; 

 antennae pale testaceous at the base, dark at the apex, terminating in two small 

 spines and a third larger flattish pointed one, paler in colour; there is also a long 

 lateral spine about half way down the antenna; mouth whorls bright golden-yellow; 

 thorax and abdomen pale brown with a double darker dorsal line, the front of the 

 thorax with four tufts of black hairs in the middle in front, then two separate 

 hairs and then another tuft on each side, two pairs of long lateral tufts, the first 

 pair with two single black bristles just behind them and a little more centrally 

 placed; the first two abdominal segments with large lateral tufts, remainder with 

 small ones; siphon short and thick, deep brown, about as long as the penultimate and 

 antepenultimate segments; a few tufts of hair near its base and also a patch of 

 characteristic spines. The last segment has a single dorsal tuft with a large bristle 

 below it; the ventral fan rather long and prominent and four ventral small tufts. 



Length. — When mature, 9 mm. 



The pupa has cylindrical siphons contracted towards the apex, with small, slightly- 

 oblique, opening; there is a dense median tuft on the first abdominal segment. The 



