FRANCIS WALKER TYPES OF, AND NEW SYNONYMIES 
FOR, NORTH AMERICAN HYDROPSYCHE SPECIES 
(TRICHOPTERA, HYDROPSYCHIDAE)* 
By Andrew P. Nimmo 
Department of Entomology, University of Alberta 
Edmonton, Alberta, Canada T6G 2E3 
Introduction 
Recently, while assembling the manuscript of a handbook to the 
Arctopsychidae and Hydropsychidae of Canada, I had occasion to 
examine the female holotypes of three species of Hydropsyche 
described from North America by Francis Walker (1852). Betten & 
Mosely (1940) record these types, but in line with the still all too 
prevalent practice regarding unassociated female Trichoptera, they 
did not illustrate the genitalia. If they had provided figures for these 
types the true identities of at least two North American species of 
Hydropsyche would have been long since established. The genital 
segments of these types are illustrated here for the first time. 
Hydropsyche confusa (Walker) 
Philopotamus confusus Walker, 1852: 103. 
Hydropsyche confusa : Milne, 1936: 61; Betten & Mosely, 1940: 21. 
Hydropsyche separata Banks, 1936: 129; Ross & Spencer, 1952: 46 
(as synonym of H. guttata Pictet); Smith, 1979: 10. new 
SYNONYMY. 
Hydropsyche guttata Pictet: Schuster & Etnier, 1978: 126. 
Hydropsyche corbeti Nimmo, 1966: 688; Schuster & Etnier, 1978: 
126 (as synonym of H. guttata Pictet), new synonymy. 
Fig. 2 depicts the genitalia of the female holotype of H. confusa 
(Walker). Fig. 1 is of the genitalia of a female which has been 
recognised as belonging to H. separata Banks. The rather obscure 
locality information recorded by Betten & Mosely (1940) indicates 
that the type of confusa was collected in the western Northwest 
Territories, adjacent to the northern boundary of Alberta. The 
female of separata was collected at Empress in southeastern Alberta. 
* Manuscript received by the editor October 14, 1981. 
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