530 TiPULiByi;. 



Genus ERIOCEEA, Macq. 



Caloptera, Guerin, Voy. de la Coq., Zool. Ins. pi. xx (1830). 

 Evanioptera, Guerin, /. c, Zool. ii, p. 2 (1830). 

 Eriocera, Macquart, Dipt. Exot. i, 1, p. 74 (1838). 

 Pterocosmus, Walker, List Dipt. Brit. Mus. i, p. 78 (1848). 

 Olu/omem, Doleschall, Natuurk. Tijds. Ned. lud. xiv, p. 387 (1857). 

 Physecrania, Bigot, Anu. Soc. Ent. France, (3) vii, p. 123 (1859). 

 Arrhenica, Osten Sacken, Proc. Acad. Nat. Sci. Pliilad. p. 242 

 (1859), 



Genotype, Limnohia nu/ra, Wied. : according to Coquillett, 

 and apparently by Macquart's designation. 



Head : eyes widely separated above by a broad frons whieli has 

 often a more or less conspicuous gibbosity, wliich is sometimes 

 bituberculate, the swelling placed behind the antenu^ ; the eyes 

 widely separated below. Proboscis short and broad, sometimes 

 not easily seen, the terminal labella sometimes very large and co)i- 

 spicuous. Palpi moderately long, sometimes as long as the head ; 

 1st and 2nd joints elongate, 3rd shorter, 4th longest of all, 

 the relative lengths varying in the different species. There are 

 two types of antennce in the male, in which sex there are only six 

 ■joints, whilst in the female there are ten. In the males of some 

 species (E. longkornis, Walk., of North America, for example) the 

 antennae are over twice the full length of the body, but in any 

 case much longer than in the female of the same species. In the 

 second type, the male antenna is practically no longer than that 

 of the female. The antennae of the elongated type vary much 

 accordino- to the species, not only in their actual and relative 

 leno-ths as compared with the females, but also in their structure 

 and in the nature of their pubescence. The 1st scapal joint is 

 (in the male antennse of the elongated type) subcyUndrical, i-ather 

 stout the 2nd joint being very short, annular ; the tiagellum 

 filiform, o-radually attenuated towards the tip, the 1st joint being 

 about as long as the thorax, the 2nd a little longer, the 3rd about 

 equal to the first two taken together, the 4th being still longer 

 than the 3rd ; the flagellar joints beset on the underside, at more 

 or less regular intervals, with strong spine-like bristles, which 

 gradually become less bristly and more hair-like towards the tip 

 of the autenmie ; the upperside of the flagellum glabrous in some 

 species, in others with even pubescence like that on the under- 

 side some additional longer irregular hairs appearing towards 

 the tip of the antennae. The male antennae of the shorter type 

 would, if bent backwards, just reach the root of the wing; they 

 are rather coarsely hairy, without verticels ; the scape is of the 

 normal form, and in the flagelluui the first joint is the longest. 

 In the female the antennae appear to have a general resemblance 

 to those of the male of the short type, namely a subcylindrical 

 basal joint to the scape, followed by a shorter second joint, the 

 1st joint of the flagellum being the longest in the whole antenna. 



