1 44 AN A ceo UNT OF BRITISH FLIES. 



the larvae as having four large posterior segments and the remainder 

 of the body, leech-like, marked by numerous annulations. Boscs* 

 describes an American species, but talks of its body as having distinct 

 segments. This does not answer to Dufour's description of the leech- 

 like body. 



There is only one species found in England, as far as we know. 



C. lineatus, F. = P. laticornis, Mg. 



Tawny. Thorax tawny, with three brown longitudinal stripes ; 

 pectus brown ; metathorax brownish. Abdomen blackish-brown or 

 black ; -there is a yellowish band with a spot on each side on the 

 anterior borders of the third, fourth and fifth segments ; hypopygium 

 brown ; ovipositor and lamellae yellow. Head brown, proboscis and 

 palpi yellowish. Antennae broad, brown, testaceous at base, about 

 as long as the head and thorax. Legs yellow ; base of tibice and 

 tarsi brown, also base of femora ; metatarsi of the anterior legs longer 

 than tibiae ; spines and spurs of the latter brown. Wings shorter than 

 the abdomen ; grayish, with apex brown, also a brown spot near the 

 centre and one below at the posterior border of wing. Length 3 J to 



Walker describes /'. lineata F., and P. laticoinis. The latter is most likely the 

 (? of Ihieata. He gives the length as 5 and 4 lin. P. (C.) laticornis is figured, 

 pi. xxiii., fig. 5. This figure resembles P. (C.) lincatus F. 



Section 5. — Macrocerifice. 



Antennae very long, filiform, i6-jointed; may be three times as 

 long as the body, longer in (J than in the ? . Body slender, pubes- 

 cent. Head small, ocelli three, eyes nearly round. Labium forming 

 two large pubescent lobes. Palpi 4-jointed, second smaller than the 



Fig. 30. — AwiQnn:^. oi z. Alacrocera, ?. 



first, fourth fairly long. Thorax short and elliptical. Abdomen 

 cylindrical in ,^ ; elongate, fusciform in ?. Legs long and slender ; 

 tibiae without spines ; their spurs very small. Wings moderately 



* Diet. d'Hist. Nat , vol. ill., 1S23. Figure of larva in the second edition of 

 same, Tab. B. 21, fig. 4. 



