85 



ILn.l small, convex, elongate anteriorly, finely and closely tubercula small, 



not prominent : antennae long, piceous, becoming paler towards the base. 



Thorax i lerate, rather broader but scarcely longer than thi head, widest behind 



the middle, abruptly and strongly constricted towards the base, finely and 

 closely tuberculate, with threi distil lit parallel lines on the disc, 



extending to either margin, the middle line being the longest, and the lateral 

 lines paralli I to the middle and faint] h extremity, basal margin 



nearly straight, with the angles prominent and acute, anterior angles much 

 defli 



tellum largi . elqngati , triangular, elevated at the base, and marked with a short 

 medial channel. 



Elytra ovate, very convex, much broader and twice longer than the head and 

 thorax, widest beyond the midd much attenuated at the shoulders, 



finely and closely tuberculate, ornamented with larger tubercles placed singly 

 at different intervals, sides margined, api and paler. 



Abdomen slightly exserted, very obtuse. 

 i rather long, bright yellow. 



/ /• ;■ parts castani ous, with the apex of the venter pale, and the coxae yellow. 



D from other species in its large size, dark colour, very convex elytra narrowed 



at the shoulders, and peculiar sculpture. In addition to the foregoing characters 

 it is distinguish* d from /'. affine by its much larger size, narrowness of the lin< s 

 on the thorax, dark antennae, and less dense pubescence. 



Habitat, Europe. Found in England by myself in Wicken Fen, Cambridgeshire ; 



also in Holland by M. Xeervoort van de Poll. 



Thi- fine -pecies is one of the largi st of the present genus, and very distinct in 

 appearance. It seems to lie very rare, since among all the continental collections 

 which 1 have examined it is represi uted only in those of M. Reiche and M. Xeervoort 

 van de poll, and in both was labelled " Pt. affine ; " under that name, therefore, I 

 described the species in the ' Trichopterygia Dlustrata.' 



Since then several specimen- of the true P. affineoi Erichson have been taken 

 in various part.- of this country by Mr. d. II. Crotch, and Mr. Morris of Lewes; 

 the occurrence of these smaller, paler, and more pubescent insects induced me to 

 compare them carefully with Erichson's description, with which I found that they 

 entirely agreed. It consequently became necessary to distinguish our present 

 species by another name, as I now have done. 



Ptilium planum. 



P. planum, Matthi ws, Trans. Am. I'.nt. Soc. \i. p. 1 1 I, I s --! ; Biol. Cent.-Amer. 



Col. ii. pt. i. p. 146, 1888. 



L. c. ,-",, lin. 0'G3 mm. — Elongatum, fere lineare, modice convexum, hand 

 nitidmn, ferrugineum, pilis flavis dense vestitum ; capite magno, antice product 

 confertim et leviter tuberculato; oculis magnis, prominentibus ; pronoto parvo, 

 tran , capite breviori, hand latiori, ante medium latissimo, confertim et 



leviter tuberculato, lati um versus fortiter contractis, modice marginatis, 



margine basali fere recta, angulis rectis ; elytris 



iiam Besqui longioribus, vix latiorib latissimis, ordinibus 



trai confertim el jperatis, lateribus levissime rotundatis, apicibus 



la t is, rotunda ti-; pedibus longis, gracilibus, fla 3 sat brevibus, laste flavis. 



Body elongate, almost linear, moderately convex, uol Bhining, ferruginous, densely 



clothed with yellow hair. 

 Head large, produced in front, finely and closely tuberculate; eyes large and very 



prominent : antennae rather short, bright yellow. 



