TWO NEW GENERA OF MALLOPHAGA. 



VERNON L. KELLOGG, 

 STANFORD UNIVERSITY, CAL. 



There have come to me recently specimens of Mallophaga, 

 taken from birds from mid-ocean islands, which demand the 

 founding of two new genera in this interesting but little-studied 

 order of parasitic insects. In the order, as at present known, 

 there are about 1,500 species, comprising twenty -three genera. 

 The small number of genera is striking in itself, but is made more 

 amazing when it is remembered that eleven of the genera com- 

 prise but thirty of the species, leaving thus nearly the whole bulk 

 of the species included in the twelve remaining genera. The ad- 

 dition of two new genera is, therefore, rather notable in the de- 

 velopment of our systematic knowledge of the group. Although 

 about two hundred new species of Mallophaga have been de- 

 scribed from North American birds but one new genus (my Gie- 

 bclia, with only one species, from shearwaters) has had to be 

 established, all the other North American species being referable 

 to genera founded on Old World species and specimens. The 

 following revised key to the known genera of the order (includ- 

 ing the two new genera described in this paper) is presented for 

 the use of beginning students of the group, or of general entomol- 

 ogists : 



ANALYTICAL KEY TO SUBORDERS OF MALLOPHAGA. 



With filiform, 3- or 5-se.; nented, exposed antennae ; no labial palpi ; mandibles ver- 

 tical ; cesophageal 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 antennas ; tarsi with one claw ; infesting mammals (family 



Trichodectidae) Ti-ichodectes Nitzsch. 



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

 opteridse). 



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