NO. 1183. NORTH AMERICAN MALLOPHAGA— KELLOGG. 41 



order are in general with the platypterons pseudo-neuropteroid group 

 comprising the Termites, Psocids, and Perlids, and are in particular 

 with the Psocida?. In the New Mallophaga^ I refer to the correspond- 

 ence between the peculiarly specialized mouth structure of the Mallo- 

 phaga and the Psocidje, and the recent careful study by Mr, E. E. Snod- 

 grass^ on the anatomy of the Malloijhaga reveal other particulars of 

 essential structural agreement between the two groups. 



As to the arrangement of the members of the order, I have proposed ^ 

 the adoption of a primary grouping into two suborders, corresponding 

 with Nitzsch's original division of the group into two families. In each 

 of these suborders there are two families, one family of each suborder 

 infesting mammals exclusively and comprising but a single genus, the 

 other family of each suborder, comprising several genera, infesting 

 birds exclusively. Mr. Snodgrass's anatomical studies jiresent new and 

 important characters for the subdivision of the order which do not 

 modify the original classification, but strengthen it and put it on a 

 more thoroughly scientific basis. These new characters have been 

 introduced into the following keys. I have made some other changes 

 in the statement of the characters of the subordinate groups, based on 

 my general study of the order and use of the keys as heretofore pub- 

 lished. 



ANALYTICAL KEY TO SUBORDERS OF MALLOPHAGA. 



With filiform, 3-or5-segmented, exposed antennaj; no labial palpi; mandibles verti- 

 cal; oesophageal sclerite and accompanying glands usually present and normal; 

 meso- and metathoracic segments fused; crop a saclike diverticulum; ingluvial 

 glands present; testes, four; egg tubes, five Ischnocera. 



With clavate or capitate, 4-segmented, concealed antennae ; with 4 segmented labial 

 palpi; mandibles horizontal; oesophageal sclerite and accompanying glands 

 absent or modified ; meso- and metathoracic segments with sutural line usually 

 visible; crop, simple; ingluvial glands, absent; testes, six; egg tubes, three to 

 five Amblycera. 



ANALYTICAL KEY TO GENERA OF THE SUBORDER ISCHNOCERA. 



A, With 3-segmented antennte; tarsi with one claw; infesting mammals (family 



Trichodectidae) Tnc/to<Zecies Mtzsch. 



AA. With 5-segmented antennae; tarsi with two claws; infesting birds (family 

 Philopteridse). 

 B. Antenna} similar in both sexes. 



C. Front deeply angularly notched AMdoproctus Piaget. 



CC. Front convex, truncate, or rarely with a curving emargination, but 

 never angularly notched. 

 D. Species broad and short, with large, movable trabecular (at the ante- 

 rior angle of antennal fossa). 

 E. Forehead with a broad transverse membranous flaj) projecting 

 beyond lateral margins of the head in the male, barely pro- 

 jecting in the female Giebelia Kellogg. 



EE. Without such membranous flap Dooophorus Nitzsch. 



DD. Species elongate, narrow, with very small or no trabeculaj. 



Nirmus Nitzsch. 



1 Volume II, 1896, p. 468. ^ ^ew Mallophaga, III, 1899. 



2 New Mallophaga, I, pp. 59-63. 



