STBAT10MYIA. 59 



" rat-tailed maggots ;" some are aquatic, h anging head downwards 

 by their tails, probably living on minute organisms ; some live in 

 mud or moist sand. The pupa floats free. The imagines frequent 

 Umbelliferas in moist situations. 



Table of Species. 



1. Hind margin of 3rd and 4th abdominal segments 



with uninterrupted yellow band fulvescens, sp. n. 



Hind margin of 3rd and 4th abdominal segments 

 with a pair of elongate spots, well separated . . 2. 



2. Thoracic pubescence moderately thick and long ; 



scutellum black, except the narrow yellow hind 

 margin and spines; $ with two conspicuous 

 yellow postvertical spots, sometimes united . . barca, Walk. 

 Thoracic pubescence extremely short and sparser ; 

 scutellum all brownish yellow ; § with no 

 postvertical yellow spots micropilosa, sp. n. 



30. Stratiomyia barca, Walk. 



Stratiomys barca, Walker, List Dipt. Brit. Mus. iii, p. 530 (1849). 

 Statiomyia barca, Brunetti, Bee. Bid. Mus. i, p. 125 (1907). 



cf $ • Head : eyes contiguous in <$ for more than half their 

 height ; shortly and -sparsely pubescent ; upper facets distinctly 

 but not greatly larger than lower ones ; vertical triangle black, 

 with a few yellow hairs ; ocelli large, brownish ; antenna? black ; 

 frons, face (punctulate), and lower part of head black, with long, 

 rather shaggy, bright yellow hair ; occiput black, with very sparse 

 pale pubescence ; hind margin of eyes with a fringe of microscopic 

 yellow pubescence. In $ , frons and face nearly half width of 

 head, sides parallel, black ; behind vertex two conspicuous bright 

 yellow oval spots, sometimes united as a large semicircular spot; 

 two very large elongate yellow calli on frons placed diagonally, the 

 inner ends nearly contiguous, the outer ends touching eyes and 

 descending below level of antennae; colour of calli extended to 

 sides of face broadly ; a broad median black stripe on face, which 

 is covered with whitish pubescence ; posterior margin of eyes 

 with merely an extremely short fringe of whitish pubescence ; a 

 considerable thickening of the orbit on lower half, where it is 

 yellow. Thorax black, punctulate, slightly shining ; closely clothed 

 with dense, rather long, brownish-yellow pubescence, which is 

 much paler on pleurae ; scutellum similar, hind border and spines 

 brownish yellow. Abdomen black, slightly shining, with an elon- 

 gate moderate-sized yellow spot on hind border at sides of 2nd 

 segment, and elongate spots similarly situated on 3rd and 4th 

 segments ; 5th segment with a elongate yellow spot, often paler 

 than the others, placed longitudinally, not attaining anterior 

 margin but extended at lower end for a short distance each way 

 on hind margin of segment. Pubescence in J brownish yellow, 

 dense and fairly long over all the surface ; in $ black, dense but 



