IIELOPIIILUS. 205 



Eitnjvu/ia, Mik, in Eeck, Faun. v. Ilernsteiu, p. 528 {sep., p. 08) 



(1885). 

 Ei/n'noniifia, Mik, Wieu. Ent. Zeit. xvi, p. ]15 (1897). 

 l'<ir/ie/o/)/ti/tis, Girschner, Illus. Wochensclir. f. Entom. ii, p. 604 



(18y7). 



GrENOTYPE, Jfusca pemlula, L. ; by designation of Curtis, Jirit. 

 Ent. (1832). 



//^eZop/a7«* differs fiom jE)'?6-<rt/is struclurally in tlie lorin of the 

 marginal cell, which is definitely tlioiigh sometimes narrowly open, 

 and in having the eyes always bare. Other cliaracters of the genus 

 are that the thorax is generally longitudinally striped and the yellow 

 markings more extensive. Head as in Eristalis, but the eyes in 

 the J always narrowly but distinctly separated, wider aparr still 

 in tlie 2 and, w ith rare exceptions, always bare in both sexes ; 

 arista always bare. Thorax generally black \\itli conspiruous 

 yellow longitudinal stripes ; usually less pubescent than in 

 Eristalis. Ahdomen nearly always blackish with large conspicuous 

 (mostly yellow) side spots and pale transverse bands. Leys rather 

 strong, hind femora thickened, occasionally furnished with a 

 ])rocess on under side, hind tibiae curved. Wings with venation 

 of Eristalis except that tiie marginal cell is narrowly open. 



Life-histonj . The larva lives in stngnant water, and is not 

 readily distinguisliable from that of Eristalis. 



Though inclined to favour marshy distvicts, HelojjJiihcs occurs in 

 nearly all localities. Its way of hovering and its other habits are 

 similar to those of Eristalis. Several subgenera have been sug- 

 gested, based on the width of the frons in the J , the shape of the 

 3rd antennal joint and the degree of prominence of the face, but 

 tlie genus, even in its widest sense, is a natural one, and is better 

 preserved in single form. 



2'ahle of SjKcies. 



1. Thorax with a transverse band of 



whitish pubescence ctirrif/aster, Macq., p. 206. 



Tliorax witliout such a band 2. 



2. Body ffiueous (c?teus, Brun., ]). 206. 



Body vellow and black, of the ordinary 



Helo///i>/us-tyT[)p. 3. 



3. I.L-iiptli U-ls niillini i>ts>f/»i.^, Walk., p. 207. 



Lf-n^'-tli '.t-12 niillini 4. 



4. Middle ft'inora in ci" witli atootli helnw 



near ba.-i', and suddenly contracted 

 at tip : 4tli abdominal sef,finent witli 



iin inverted, widely ojieii V-i">"'l<* • lieiK/nlcnsis, "Wicd., p. 20!>. 

 Mi(klle Ifinora in J without tootli 

 beh)w,aiid very {jfradually iiarmwcd 

 in apical part; 4tli abdominal .•<e<r- 

 nit-nt without a V-'ii''ii'l< rpuKtriri/tdfns. Wiod., p. 210. 



• Sometimes almost areuale. 



