390 



terior margins narrowly, but conspicuously, pale lemon-yellow in 

 male, but with the pale and dark colors almost equally divided in the 

 female ; the legs with but little indication of pale color at base of sec- 

 ond tarsal joint, appearing infuscated from apex of basal joint to 

 their tips. In other respects similar to bcUus except that the hypo- 

 pygium is as represented in Figure 7, Plate XX\^III, and that gen- 

 erally the insect is a little larger, averaging 3.5 mm. 



Localities : type, Thompson's Lake, Havana, May, 1912; para- 

 types, same locality, April 19, 1898, and April 30 and May i, 1912; 

 allotype, Havana, April 20, 1898. 



The larva and pupa are unknown to me. 



I do not consider it probable that the foregoing can possibly prove 

 to be a color variety of helliis; but even in the event of such proof 

 being forthcoming it will be necessary to retain the varietal name. 

 There is, however, in the mount of bclhis which I have prepared a 

 good distinction from riparius in the shape of the apical portion of 

 the lateral arm of the hypopygium, and this should, I think, entitle the 

 two species to separation, though in other respects, except color and 

 size, they are almost identical. 



Procladius Skuse 



The imagines of this genus may be separated from those of Tany- 

 piis and Protenthes by the absence of the surface hairs from the 

 wings. It is, however, difficult to detect the hairs in some species of 

 Protenthes, but I consider it highly probable that the obcordate fourth 

 tarsal joint dnd bare wings will be found together, and that the spe- 

 cies with the elongate fourth tarsal joint will invariably have surface 

 hairs on the wings, though at times it will be difficult to distinguish 

 them. I have not at the present time sufficient material to permit my 

 making a definite statement on this point, but the species which I have 

 in hand justify this opinion, and that is as far as I can go safely. 

 Were it not for the fact that Johannsen has described the larva of 

 Procladius adiunhratiis as being almost identical with that of 

 Protenthes culiciforniis I should suggest that the shape of the labial 

 plate of Procladius concinnus furnishes a character for distinguishing 

 the larvae of this genus from those of Protenthes. I may also men- 

 tion that the Procladius larvae I have seen are invariably red or red- 

 dish, while the other genera have invariably whitish yellow or brown- 

 ish larvae. However, unless Johannsen confused his material this 

 rule will not hold. 



