04 PEOBOSCTS, THORAX, AND ABDOMEN. 



branched hairs (see Figure 9).* Proboscis projecting as already 

 described and, with the palpi, curving slightly downwards ; red- 

 dish-brown below, glistening j'ellowish-white above nearly to the 

 tip, which is marked off by a slight constriction and exhibits 

 beneath a tiny but conspicuous black spot ; the bulbous base 

 of the prf)boscis is enwrapped posteriorly with a fold of skin 

 forming the hind wall of the buccal cavity. Palpi rod-Hke, 

 of the same width throughout, neither swollen nor tapering 

 towards the tips, clothed with short black hair.-? and minute 

 bristles, a row of some eight to thirteen tiny erect black bristles 

 running along the upper margin, the individual bristles separated 

 by something like regular intervals, and a similar row running 

 along the outside on the basal two-thirds of the palpus ; two 

 somewhat longer and stouter bristles "I* directed downwards and 

 forwards on the under and outer side immediately before the tip, 

 (For the bristles of the head see below under " Chsetotaxy. — 

 Cephalic Bristles.") 



Thorax quadrate, flattened or only very slightly arched above, 

 to the naked eye appearing bare, but in reality sparsely clothed 

 Avith minute black hairs ; the macrochjetpe likewise few in 

 number, arranged as described below under " Chsetotaxy." 

 Transverse suture well-marked, forming a groove. Scutellum 

 flattened, with a pale impressed median line, and a darker patch 

 on each side. Markings of the thorax very inconspicuous, and, 

 if distinguishable at all from the ground colour, taking the shape 

 of gi-ey or brown blotches, streaks, or spots. 



Abdomen also flatteiierl, tapering to the apex, thinly clothed 

 with minute and exceedingly short, appressed black hairs, which 

 on the basal angles of the second segment become longer and 

 erect, and on the hind margins of the following segments, from 

 the third to the fifth, take the shape of fine black bi-istle-like 

 hairs, especially on the apical angles, where they are longest and 

 stoutest ; hind margin of the sixth segment, and also that of the 

 seventh in the female, with a complete row of longer bristle-like 

 hairs ; seventh segment in the male with an especially conspicuous 

 transverse row of black bi-istle-like hairs or fine bristles on each 

 side of the median line beyond the middle. The male hypopygiiim 



* The number of these hairs is usually about twenty-two or twenty- 

 three, but sometimes there arc not more than eighteen, while in other 

 cases there may be as many as twenty-eight ; the numbers on each arista 

 may even be unequal in the same specimen. 



t In dried specimens these are often missing — one at least is frequently 

 indistii'.Kuisbable. 



