32 [February, 



abdomen is narrow and elongate, the stigma pale at tbe base, and 

 (as said above) the 2nd cubital n. absent. I only know for certain 

 three of its species r.s British, which I distinguish as follows : — 



TABLE FOR BRITISH CRYPTOCAMPUS SPECIES. 



1. Face, including clypeus, quite black in both sexes ater,3\x\'. 



At least the apex of clypeus in the ? , and nearly the whole face in the J , 



whitish or yellowish ; 2. 



2. Larger— often quite 5 mm. long. Apex of saw-sheath ( ? ) viewed from above 



(not laterally) rounded. Claws (according to Thomson) with sub-apical 



tooth, and gense buccate medullarius, Htg. 



{= pentandrte, Thorns, and Cam.). 

 Smaller — scarcely 4 mm. long, or less. Apex of saw-sheath (?) viewed from 

 above sharply pointed. Claws bifid saliceti, Fall. 



Ater is probably identical with angustus, C. A specimen in Dr. 



Caprou's coll., called angustus, so far as I can see, does not differ 



from others named for me by Konow as ater. In some of these 



the tegulse are absolutely black, in others merely a little dusky. 



I do not know the species described by Cameron as nigritarsis 



and Jlavipes, nn. spp., and think it better in these papers to say as 



little as possible about forms unknown to me in nature. But I may 



mention that Konow considers that the latter =^ testaceipes, Br., an 



insect which I have not seen. 



From CrgptGcampus we ought, perhaps, to pass next to the genus 

 most closely allied to it, viz., Pontania. But, as I have already men- 

 tioned the leg-character by which Croesus and Holcocneme species 

 may be so easily recognised by collectors, I will endeavour to dispose 

 of these two genera now, reserving Pontania, &c., for my next paper. 



Cecesus, Leach. 

 With Croesus (though we have apparently only three species, and 

 those the same that are described by Cameron) 1 have had for some 

 time past great trouble. This was due partly to mistakes into which 

 I was led by Mr. Cameron's statements as to the coloration of the 

 species, which are sometimes incorrect, and even self-contradictory ;* 

 and partly to an unlucky accident, by which some specimens bred by 

 Miss Chawner separately from larvae of latipes and septentrional is got 

 somehow confused and wrongly labelled — at least, that was the con- 

 clusion to which I came after long puzzling over them, and on sending 

 them to Herr Konow for his opinion he assured me that such must 

 undoubtedly have been the case. 



* He says, «. g., tliat in latipes, 6 , " the apex of the abdomen is entirely brownish-red," and 

 shortly after that it has " part of the sixth "(? segment) " and the seventh and eighth entirely 

 black." 



