of certain species of Willow. — Part 2nc7. 2G9 



optica] illusion caused by the hair parting there, and appears and dis- 

 appears as the light is changed. Besides the two bands on the elytra 

 mentioned by Say, there is a third irregular more or less distinct ma- 

 cular band near their tip. Length .08 — .11 inch, exclusive of the ros- 

 trum, which in all my specimens is depressed; .10 inch according to 

 Say, nothing being said about the rostrum. 



Ten specimens, one of them bred Aug. 11 from the Cecidomyidous 

 gall X brctssicoidez Walsh, the rest captured at large. The size of the 

 clytral bands varies slightly, but on the whole it is a pretty constant 

 and well-marked species. 



Apion lanuginosum, n. sp. — %? Black. Head finely and closely punctate 

 except on the glabrous vertex, and with fine, short, appreased, white hairs; ros- 

 trum strongly punctate, except at the extreme tip, but without hairs, basally 

 opaque terminally subpolished, aa long as the head and thorax together, cylin- 

 drical throughout, arquated in a circular arc of 45°, thrice as long as wide when 

 viewed laterally, the antennce inserted 2-5ths of the way to the tip. Thorax 

 closely and more coarsely punctate, with very long, rather dense, partially 

 erect, white hairs; as long as wide, its sides behind the middle parallel or scarce- 

 ly converging towards the scutel, before the middle converging in a concave 

 circular arc of about 30°, so that the thorax is J-5th narrower before than be- 

 hind. Elytra about If times as long as the head and thorax together, exclu- 

 sive of the rostrum, punetato-striate, the strise deep, the punctures large but 

 not obvious, the interstices rounded and very finely punctato-rugose, with very 

 long, rather dense, partially erect, white hairs. Legs and all beneath, black, 

 with fine and short appressed white hairs. Length, exclusive of the rostrum, 

 .07 inch. 



Two % (?) specimens, bred Aug. 22 and 29 from the Cecidomyidous 

 gall S. strobiloides 0. S., and also 1 ( % ?) specimen captured at large 

 in company with 2 out of 9 9 (?), all of which 9 differ from the de- 

 scription only in the rostrum being \ longer than the head and thorax 

 together, and 4 -J- (not 3) times as long as wide when viewed laterally, and 

 in its having the antennae inserted scarcely l-3rd (not 2-5ths) of the way 

 to the tip. I observe similar sexual differences, but much more obvious, 

 in many Balaninus which I have taken in colt a belonging to nasicus 

 Say and sparsus Schonh., and the same thing is well known to occur 

 in Arrhenodes septentrionis % 9 Hbst. A. lanuginosum differs from 

 A. rostrum Say, A. pensylvanicum Schonh. and 5 or G other species in 

 my collection, by the white hairs giving the insect a distinctly gray ap- 

 pearance, as in A. segnipes Say; from which species, however, it is 

 separated at once by the rostrum not being basally thickened and by 

 the legs not being partly rufous. From t lie description of A. porca- 

 titm Schonh. it differs also in the cylindrical rostrum, and from that of 

 A. recondition Schonh. in being black, not brassy-black. 



PROCEEDINGS EXT. S0C. P1IILAD. JANl.WtV, 1867. 



