i889.| 343 



April 22nd, 1889. — Agriotypus imago and fully developed nymphs; 

 Silo nigricornis larvae or very young nymphs. Found at Hradek near 

 Litomyshle. 



June 8th, 1885. — One ? Agriotypus fully developed in a case of 

 Goer a pilosa, F. ; Goera pilosa caught in the stage of imago, and 

 also developed larvse and young nymphs. Susihce in South-Western 

 Bohemia. 



June 30th, 1886. — Agriotypus in the stage of larvae ; Silo nigri- 

 cornis as larvae and nymphs. Hradek. 



Second part of July, 1888. — Agriotypus as larvae and subnymphs ; 

 Silo pallipes almost as imago only. The rivers Ticha and Divoka 

 Orlice in North-Eastern Bohemia. 



September 17th, 1886. — Agriotypus in the nymphal stage. Ne- 

 doshin near Litomyshle. 



September 20th, 1886. ■ — Agriotypus in the nymphal stage. 

 Hradek. 



It is, I think, evident from this series, that there is only one gene- 

 ration of Agriotypus in each year. The imago lives from April to 

 June ; the female lays its eggs on the cases of the host ; it lives as 

 larva till the end of July, or a little longer ; changes into the sub- 

 nymph stage ; and in September it is grown to a fully developed and 

 already dark coloured nymph. In this stage Agriotypus remains 

 during the winter. 



The species I have observed to be infested with Agriotypus are 

 Silo nigricornis, Pict., Silo pallipes, F., and in one case Goera pilosa, 

 F. I have found as yet no agriotypized cases of Odontocerwm albi- 

 corne, Scop., but it is quite possible that this species of Leptoceridce, 

 though less allied to Silo, does suffer by this parasite ; it lives in the 

 same waters, and most commonly in company with Silo and Goera. 



Agriotypus has been noticed as yet in the following countries : — 

 in Scotland by Walker, in France as mentioned by Westwood, in 

 Bavaria by Dr. Kriechbaumer and Yon Siebold, in Styria by Oberl. 

 Kroftschick, in Bohemia by Kolenati and myself, and in Southern 

 Sweden in three different localities (Holmgren). I believe that it will 

 be found very common. 



EXPLANATION OF FIGUEES. 

 A, Agriotypus armatus, ? imago ; B, nymph ; C, subnymph ; D, larva (all x 6) ; 

 E, an agriotypized case of Silo nigricornis (nat. size) ; E, mouth parts of larva of 

 Agriotypus ( x 175) ; G-, section cut through an agriotypized case of Silo nigricornis 

 (x3). 



Prague : 1889. 



