BY FREDERICK A. A. SKUSE. 87 



division, and the antennae are different. In the P. gracilis division 

 the first joint of the scapus is moderately long (PL vi., fig. 31), in P. 

 lineata it is longer, and in P. inornata very long, nearly one-third 

 the length of entire antennae (PL vi., fig. 32) ; in the former there 

 are always four simple terminal joints in the ^, six in the <^, but in 

 P. lineata (5) there are four, and in P. inornata (9) six simple 

 terminal joints, the second to ninth flagellar joints being branched 

 instead of the second to seventh as in all the other species. If 

 the males of P. lineata and P. inornata exhibit any important 

 difference in the structure of the antennaj, these two species 

 probably should be referred to another genus. However, I 

 believe P. inornata to be the same as the insect referred to by 

 Baron Osten-Sacken (Studies I. p. 178), in which the branches of 

 the antennae are equally long in both sexes, a third about the 

 middle, first joint remarkably long, &c. In the first division the 

 tarsi are very long, and the second posterior cell is only in puncti- 

 form contact with the discal ; while in the second the hind tarsi 

 are only about one-third longer than the tibiaj, and the second 

 posterior cell is in complete contact with the discal. Certainly 

 the latter may not be a reliable character. 



399. Plusiomyia gracilis. Walker. (PL iv., fig. 8.) 



Pedicia gracilis, Walk., List Dipt. Brit. Mus. I. p. 37, 1848 (sine 

 patria); Ozodicera longipedalis, Westwood, Trans. Ent. See. Lond. 

 p. 503, pL 3, figs. 4, 4a, 4b, 1876 ; Trans. Ent. Soc. Lond. p. 381, 

 1881 ; O.-Sacken, Studies, L p. 177, 1886. 



(J. — Length of antennae 0-240 inch ... 6-09 millimetres. 



Expanse of wings 0-850 x 0-180 ... 21-58x4-56 



Size of body 0-850x0-100 ... 21-58x2-54 



5. — Length of antennae 0-300 inch ... 7*62 millimetres. 



Expanse of wings 1-060x0-220 ... 26-94x5-58 



Size of body 1-350x0-150 ... 34-28x3-81 



Head ochreous, with a whitish bloom ; rostrum and basal joints 

 of antennae fulvous, sometimes more obscure ; fl-agellar joints 

 brown ; suctorial labella and palpi black ; 9 antennae longer than 



