A NEW SPECIES OF POLYCENTROPUS. d 



empty nymph-cases were found, and six more within the next 

 few days. Of these, six were lying on the turf, two were 

 hanging from blades of grass, while the remaining two were 

 firmly attached to the stalks of bracken some two or three 

 inches above the ground, in a manner similar to that in which 

 the nymph-cases of many dragonflies are to be found. It 

 seems clear that the last four were in the position that the 

 nymphs themselves assumed, the others having probably been 

 dislodged by rabbits or other browsing animals. Although none of 

 the imagines were found actually at this spot, four (two males 

 and two females) were captured in the near neighbourhood. 



The following particulars regarding the nymph-cases may 

 be of interest : — 



Length of male, 15'5 mm.; female, 20 mm. Length of 

 wing-case : female, 7 mm. ; male, 5'5 mm. Dorsal split along 

 head and thorax, through which the imagines have escaped. 

 Surface slightly pubescent, especially ventral surface of abdo- 

 men and legs. Colour pale ochre, with dark dorsal bands at the 

 sutures. The fore legs are modified for digging, somewhat as 

 in the mole-cricket, and in every case soil was adhering to them. 

 The tongue appendage and wing-cases are free, as, of course, 

 are the legs, and traces of the ovipositor may be discerned in 

 the female. 



My best thanks are due to Dr. D. Sharp and Messrs. 0. W. 

 Colthrup, W. J. Lucas, and Claude Morley, for kind help in the 

 preparation of these notes. 



A NEW SPECIES OF POLYCENTROPUS 

 (TKICHOPTERA). 



By Kenneth J. Morton, F.E.S. 

 (Plate II.) 



In a small lot of Neuroj)tera (in the Linnean sense), collected 

 by the Piev. A. E. Eaton in the Pyrenees in 1905, and kindly 

 presented by him to me, there are included three specimens of a 

 Polycentrojms which is evidently undescribed, and which pos- 

 sesses appendages very different from those of any of the other 

 known species. 



McLachlan (Mon. Eev. and Syn., first additional supplement, 

 p. 54) gave up the attempt to describe the insects of this genus 

 from general characters, and relied entirely on the appendages 

 as a means of separating the species. He found it practically 

 impossible to give any intelligible description based on form, 

 colour, and size. The present species is quite as ordinary 

 looking as the others, while it takes a foremost place with 

 respect to the peculiar structure of the appendages. 



b2 



