FRUIT FLIES OF THE GENUS DACUS. Ill 



two oval black spots placed very low, in contact with the oral border ; subocular 

 dark spot distinct, but less defined ; palpi and antennae yellow, the latter w^ith the 

 third joint darkened at the end ; all the bristles are black, and there are three pairs 

 of lower orbitals. Thorax entirely black, punctulate, grey pollinose on the back, 

 with black bristles ; middle scapular very thin, the outer strong ; there is no trace 

 of an anterior supra-alar bristle, but of this important point I am not sure, the specimen 

 being unique ; praescutellar well developed ; pteropleural thin. The thorax 

 shows the following bright yellow markings : — the humeral calli ; a broad, exactly 

 triangular mesopleural stripe, which terminates in a straight hne above at the 

 notopleural suture, the sutural callus being black, and is not continued below on the 

 sternopleura, which is entirely black, with only a dark brown spot above ; two 

 contiguous hypopleural spots ; three yellow stripes on dorsum behind the suture, 

 the middle a little narrower than the lateral ones, all abbrex-iated long before reaching 

 the scutellum. Mesophragma entirely shining black. Scutellmn yellow, with the 

 base narrowly black ; at the apex there is a well defined shining black spot, which 

 is sufiiciently broad to fill the space between the bristles and is pointed anteriorly in 

 the middle, reaching the middle of the scutellum. Halteres pale yellow. Abdomen 

 black, punctulate, with grey pubescence like the thorax ; first and second segment 

 with an equal transverse yellow band on the hind border ; third and fourth each 

 with a small semi-lunar spot at the hind border on each side of the middle line ; on 

 the fifth segment these two spots are dilated so as to make almost the entire segment 

 yellow, vnth a black middle hne and a black base ; basal segment of the ovipositor 

 flattened, broad, as long as the last abdominal segment, black, dark reddish along 

 the middle ; second segment yellowish red ; venter black, Avith a reddish basal band. 

 Legs with the front femora almost entirely black, yellow only at the base and at 

 the extreme tip ; middle femora also black, but a little more broadly yellow at 

 the base ; hind femora with more than the basal half whitish, the remainder black ; 

 tibiae blackish, but the middle ones broadly pale in the middle ; intermediate tarsi 

 yellow, the others dark, with the praetarsi whitish ; coxae brown. Wings hyahne, 

 with dark yellowish veins ; fore border narrow, but complete, blackish, extending 

 from the stigma over the end of the third vein, where it is a httle dilated, but not in 

 the form of a spot ; first basal cell broadly darkened above the second ; a small dark 

 spot at the end of the fifth vein and lower end of the hind cross- vein ; anal streak 

 broad and dark ; last section of the fourth vein a little curved at the base. 



Type $, a single specimen (British Museum) from Goorghalh Estate, 800 ft., 

 S. Mysore, 14-24. iii. 1913 (T. B. Fletcher). 



18. Chaetodacus biguttatus, sp. nov. 



An eminently characteristic species, distinguished from any other at present known 

 by its scutellum being entirely black, with a small yellow spot on each side and bearing 

 only the apical pair of bristles. 



(^. Length of body, 5*5 nun. 



Head with shining black occiput, w^hich is margined with a rather narrow yellow 

 border, which is arcuated below the vertical area and very little dilated below ; frons 

 pale yellow, but dark brown along the middle stripe and with three pairs of ill-defined 

 dark spots at the sides ; ocellar dot and lunula black ; face shining yellow, with two 



