102 t'^*'^^' 



experience goes I should ^ny not we do not use the agent in 



sufficient quantity for that. ]My gravest doubt is whether, after a 

 lapse of time, it may not cause insects to fade ; I fancied that, in the 

 case of two S. ccmbra? which had been over long in the vapour of the 

 impure albo-carbon, there was a slight tendency in that direction : but 

 it is my intention to pursue this subject, which is of course one of the 

 utmost importance, seeing that not only our National, but also all 

 the chief, collections in the country are now preserved by means of 

 Ifaphtkalin. 



London : April, 189G. 



HYDROPTILID.E COLLECTED IN ALGERIA BY THE 

 REV. A. E. EATON. 



BY KENNETH J. MORTON, F.E.S. 



Some time ago Mr. McLachlan sent to me for examination a large 

 number of HydroptilidcB collected by the Eev. A. E. Eaton in Algeria 

 during the years 1892-3-4. These represented at least the most im- 

 portant, if not the only, collection of these insects ever made in 

 northern Africa, and I looked forward to their examination with much 

 interest. Now, when the examination has been completed, I find that 

 the collection proves to be of consequence, not on account of new 

 species contained therein, but from the fact that its constituents are 

 almost entirely of a European character. This latter feature is not 

 one of a merely representative kind, but almost absolute, the species 

 agreeing so closely with known European forms that I can only find 

 two whose genitalia appear sufficiently distinct to warrant their being 

 considered new, and one of these belongs to a well known Palsearctic 

 group. Further researches will no doubt add to the list of Algerian 

 UydroptUidce, but I do not think the conclusions come to with regard 

 to these first-fruits will be much altered by future results. 



The collection contains the following species : — 



1. Allotrichia pallicornis, Eaton. — In large numbers from Bouzarea (April 3rd, 

 1893), and two examples from El Biar (April 17th, 1893) ; both localities near 

 Algiers. I think there can be no reasonable doubt that these are really A. palli- 

 cornis. The enormously large foliaceous inferior 

 appendages are apparently identical with those 

 of the English example, from which Mr. McLach- 

 lan made his description (Mon. Rev. Sjn., p. 509). 

 In the latter the superior trifid plalie is very 

 distinct, but in all the Algerian males the details 

 of that particular part are obscured by the great 

 exscrlion of the penis and the accessory parts. A figure of the penis is here 

 given. 



