ig 1 3.] M. Bezzi : Indian Trypaneids {Fruit-Flies). 109 



out into a point as long as the second basal cell ; third vein bristly throughout its 

 length ; costal bristle well developed. 



Type: Dacus modestus, Fabricius, 1805. 



This genus is very similar to the Neotropical genus H exachaeta , Loew^from which 

 it differs in the want of the oc, in the presence of only two lower or., in the face 

 being not concave and in the plumose arista. 



17. Diarrhcgma modcstum, Fabricius. 

 (PI. viii, fig. 19.) 



Fabricius, Syst. Antl, 278, 29 [Dacus'] {1805); Wiedemann, .\uss. Zweifl., ii. 493, 26 [Trypcta] 

 (1830); Osten-Sacken , Berlin, entom. Zeitschr., -Kxvi. 227 [Trypeta] (1882); Wulp, Tijdschr. v. 

 entom., xli. 219, 6, pi. 10, f. 17 [Ptilona] (1898); Meijere, Bijdr. tot de Dierk., xvii. tii [Rioxa] 

 (1904); Enderlein, Zoolog. Jahrbuch, xxxi, 449 \Rioxa\ (igri); — incisum, Wiedemann, Anal., 

 53, 117 \Trypeta'] (1824) and Auss. Zweifl., ii. 500, 37 \Trypeta'\ (1830) •,—paritii, Doleschall, 

 Tijdschr. ned. Ind., x. 412, 38, pi. i, f. 2 [Tephritis] (1856) ; Enderlein, Zoolog. Jahrbuch ; xxxi, 

 449 [Rioxa'] (191 1). 



A yellow middle-sized species, with brown spots on the thorax and black trans- 

 verse bands on the abdomen. 



Or. yellow; the inner vt. yellow, the outer black; pvt. dark yellow or black; 

 genal bristle black, and above this some other (3-4) weaker black bristles. Thoracic 

 and scutellar bristles yellow, sometimes darkened or blackish at the base, but the 

 scapulars black . Row of the front femora with 7-9 black bristles ; hairs of the hind 

 tibiae pale yellow. The stigma shows sometimes the trace of a yellowish spot, 

 chiefly in immature specimens. 



The species has been placed in Rioxa by Prof. Meijere on account of its chaeto- 

 taxy and the pattern of the wing ; but it differs from the true species of that genus 

 in the shape of the head , which resembles that of the preceding genera . The whitish 

 patch on the mesopleura shows also affinity with the preceding. 



The species was originally described from Bengal, and Doleschall has it from 

 Amboina; it seems to be not uncommon in India as the collection comprises many 

 specimens from Calcutta, February, May and July, some of these bred from decayed 

 wood. Some specimens are labelled Trypeta mn'sa, Wied., in Bigot's handwriting. 

 Many additional specimens from Khargpur, Bengal, 17 — 30-vi-ii {R Hodgart). 



7. Ptilona, Wulp. 



This genus, as here restricted, is easily known from any other by the reduced 

 chaetotaxy of the head and thorax. 



Shape of the head approaching to that of the preceding, the head being distinctly 

 higher than broad, but the eyes not so narrowed as in the preceding. No oc. ; vt. 2, 

 weak, the inner also very short; pvt. parallel; or. i. i , the second pair only of the 

 superior or. being present in the middle of the front; genal bristle rather stout ; 

 vibrissal edges with short bristles; a row of black occipital bristles ; antennae inserted 

 at the middle of the eyes, very short, the third joint being about as long as the 



