i'l Ml-. B. F. Ouinniings on the Head and 



seems almost certain that it is congeneric. When more 

 specimens can be obtained it may prove to be the same 

 species. Only one specimen is known. 



EXPLANATION OF PLATE I. 



Fiy. 1. Hhegaster borealis, Ver. Type, a, dorsal side ; h, actinal side of 



the same. X 2^ {b). 

 Fig. 2. JR/ier/aster spimtlosus, Ver. Type, f nat. size. 

 Fiff. 3. Pvranisca lejndus, Ver. Types, a, one of the larger specimens ; 



b, c, d, three small ones, x Ij. 



HI. — JS^oieon the Characters of the Heed and Mouth-parts 

 in the Genera Plectiotarsnsa?iflf vEthaloptera {Tiichoptera). 

 By Bruce F. Cummings, British Museum (Natural 

 History) . 



(Piiblit^hed by permission of the Trustees of the British Museum.) 



For being able to present an account of the head and nioutii- 

 trophi of tliese two remarkable genera of Trichoptera 1 am 

 indebted first of all to Dr. Georg Ulnier, of Hamburg, who 

 generously sent me spiiit-niaterial of yiElhaloplera, and, 

 secondly, to Mr. James A. Keisbaw, Acting Director of the 

 National Museum, Melbourne, who kindly gave me several 

 sjjecimens (dry) of Plectrotarslis gravenhoi'stii, Kol, 



I'he Head f/^tiialoptera dispar, Brauer 

 [Famtlij Hydropsychidse). 



The first species of ulEthaloptera was made known by 

 Kolenati in 1859 under the nanie Setodes sexpunctata (an East- 

 Indian insect) (i). One of the essential characters of the 

 genus Setodes is given as " palpornm maxillarium articulo 

 basali brevissimo," so that wiien, in 1875, Brauer, in de- 

 scribing a second species — the one at present under considera- 

 tion (irom W. Africa) (2), — observed the complete absence 

 of palpi (maxillary and labial), he decided, on this and other 

 grounds, to found a new genus {^thalopttra) . In subse- 

 quent descriptions of other species of this genus I have been 

 unable to tind any detailed reference to the moutli-trophi, 

 with the exception of tlie general statement " Mundteile feii- 

 lend," made by Ulmer in 1907 (3). 



But, as will be seen from the illustrations given below. 



