112 Mr. W. F. Kirby on a new Species of ' Dra<jon-jly. 



in the body-cavity of their host, without any communication 

 whatever between the air of their tracheal system and the 

 atmosphere. This state of things I have observed, how- 

 ever, not only in the Ugimyia-m&ggot, but also in maggots of 

 other parasitical Diptera, of Tachina, Lucilia, flypoderma, 

 &c, the genus Gastrophilus alone making an exception *. 



Summing up the results of my investigation, I come to the 

 following conclusions : — (1) Mr. Sasaki is right, undoubtedly, 

 in his opinion that the eggs of the Ugimyia find their way 

 into the body of the silkworm through its mouth ; and I 

 should think that other caterpillars also are infested in the 

 same way. (2) The Ugirnyia-m&ggot for a while only is 

 located immediately inside one of the silkworm's stigmata, 

 and certainly does not form its bed " by heaping up fats and 

 muscular fibres ; " but the bed is a widening or swelling 

 of the trachea itself. This fact is fully in accordance with 

 what is known of the parasitical life of many Tachin a-larvse. 

 (3) The plates of the spiracles or stigmata of the Ugimyia- 

 maggot are quite closed, a fact that may be observed also in 

 other Musca- and (Estrns-kirvdz, the genus Gastrophilus 

 alone excepted. 



Copenhagen, 

 November 12, 1889. 



XV. — Description of a new Species of Dragon-fly. By W. 

 F. Kirby, F.E.S., Assistant in the Zoological Department, 

 British Museum. 



Dr. Karsch has lately pointed out, in the l Entomologische 

 Nachrichten,' that my Fylla exigua is apparently identical 

 with Nannop>hya pygmcea, Ramb. 1 find that I had been 

 misled by an old label attached to a pair of an undescribed 

 genus and species in the British Museum. These I now 

 describe, although they are without locality, as I have already 

 described the genus and figured the neuration under the name 

 of Nannopkya, and this seems to be the readiest means of pre- 

 venting further confusion. I think it probable that the speci- 

 mens are from some part of the Malay Archipelago. 



* For further information concerning the evolution of the spiracle- 

 plates I may refer to a little paper, '' Ugimyia-Larven og dens Leie i 

 Silkeormen,' which I am publishing in the ' Entomologiske Meddelelser,' 

 Bd. ii. 1890, with some figures. 



