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authority of Mr. E. A. Schwartz but I cannot think that Cola- 

 cina and Elcnchus are identical. At any rate this is true 

 Elenchiis, and it does not seem Hkely that Westwood would have 

 so forgotten this genus, which he knew well in 1840, as to make 

 a new one for the same insect years afterwards. Mr, Koebele 

 found in Ohio, at the same time as Elcnchus, that a Jassid 

 [Agallia) was also affected by a Stylopid parasite. On a slide 

 are some mutilated specimens in balsam of the male parasites, 

 which he found stuck to the glass in the tubes in which these 

 Agallia were kept alive. I cannot see any difference whatever 

 between these males and the Elcnchus bred from Liburnia, but 

 on examination of the dead Agallia, I find female Stylopids of 

 a character so utterly different from that of Elcnchus, that I 

 imagine a Liburnia must have been accidentally included, from 

 v.'hich the males in question emerged. Moreover the larvae 

 from these females are different from those of Elcnchus. 1 think 

 ii probable that the male of these females will prove to be a 

 Halictophagus, but Mr. Kocbele's well known accuracy and his 

 opinion that the males sent came from Agallia, make further 

 investigation necessary. By this I mean it is necessary to in- 

 vestigate Agallia, to prove whether it is at any time attacked by 

 Elcnchus. That these female Stylopids found in Agallia do not 

 belong to that genus needs no investigation, and there is no 

 possibility of their belonging to the males supposed to have 

 been bred from the same leaf-hoppers; indeed there is no reason 

 to doubt that they belong to the Halictophaginae. 



THE LARVAE OF STYLOPIDAE. 



The larvae of Stylopidae when they emerge from the brood- 

 chamber of the female are often called triungulins, but very in- 

 appropriately so, since they entirely lack the very structures for 

 which the name triungulin has been applied to the first instar 

 of larval Mcloc and otner beetles, ihe larvae of Styloipds para- 

 sitic on Homoptera are much smaller and more difficult to study 

 than are some of t'he wasp-oarasites, and I have therefore figured 

 in ventral view a larva of one of the latter (which is allied to 

 Xenos) for comparison. This larva (PI. IV, 5) when highly 

 magnified is like Lcpisina in general appearance and otherwise 

 is chiefly remarkable for the great pigmented eye-spots around 

 the lenses, and the structure of the elongate legs. The first two 

 pairs of these terminate in the rounded pad noticed by writers 

 on larval Stylops, but the hinder pair bear in place of this a long 

 fine spine or seta, from which, near the extremity, there arises a 

 Hner and strongly curved one. 



