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It is perhaps worthv of notice tliat the male puparia of the 

 species of Halictopliagiis parasitic on Jassids, pierce the dorsum 

 or even the venter of the abdomen of these leaf-hoppers, but 

 the head of the female is always, or nearly always, thrust 

 through the pleura. On the contrary in Elciiclnts and Dcinc- 

 IcncJins, parasitic on Fulgorids, the male puparium (as well as 

 the head of the female parasite) is exserted from the pleural 

 region only. 



In the case of the Halictophaginac we" found only mature 

 leaf-hoppers to contain mature female parasites and puparia; 

 but in the case of ElcncJius tcmiiconiis the nvmph or adult 

 Delphacids will alike '^roduce mature parasites of either sex. 



CLASSIFICATION. 



The dififerences between the various forms here considered 

 are so great, that if the Stvlopidae are considered as a family of 

 Coleoptera, they must represent three sub-families; or if these 

 oarasites be treated as a separate Order, Strepsiptera, they 

 might even form three families. The marked differences in the 

 head, legs, and thoracic sclerites being probably suflficient to 

 warrant the higher division. Thev may be distinguished as 

 follows : 



r. Tarsi 4-jointed Stylopinae. 



2. Tarsi •^-jointed Halictophaginae 



3. Tarsi 2-jointed Elenchinae 



As personally I consider the Stylopidae to be a Coleopterous 

 family, the divisions here are treated as sub-families. 



The first of these divisions is capable of further subdivision, 

 of a character in my opinion more than merely generic, but it is 

 not necessary to enter into these minor distinctions here. The 

 family will, naturally, be placed next to the Mordellidae (incl. 

 Rhipiphoridae). 



The measurements and descriptions of the female Stylopidae 

 are made from the head, as it appears when the animal is im- 

 bedded in Its host; for the variation in the length of the exserted 

 portion in different individuals is very small. 



Female Elenchinae are (so far as the species collected by us 

 are concerned) easily distinguished from Halictophaginac by 

 the absence of the median apical plate and other apical struct- 

 ures, and the presence of discal areas in front of the brood- 

 chamber opening. 



