AKT- -«• STUDIES OF THE BITING LICE EWING. 7 



e*. Abdomen with but few setae above, some of which are 

 large and in longitudinal rows, four such rows are al- 

 ways present Tetragyropus, new genus. 



c'\ Tarsus I provided with two claws. 



d^. Tibia I swollen on its inside near its tip into a more or less 

 thuuibliko tubercle ; tarsus I with first and second segments 



about equal Macrog^yropiis, new genus. 



d*. Tibia I not swollen into any thumblike tubercle near its tip; 

 tarsus I with segment I twice as broad as long and about half 



as long as segment II Heterog^yropus, new genus. 



6 ^ Palpi two segmented ; second tarsal segment of second and third legs 

 never clawlike, femur of same legs not provided with any forked ten- 

 aculum GLIRICOLINAE. 



c\ Anterior horns of hypopharyngeal chitinization unarmed. 



Paragliricola, new genus. 



c." Anterior horns of hypopharyngeal chitinization each armed with a 



row of teeth at its tip Gliricola Mjoberg, 



Protogyropinae, new subfamily. 



The new subfamily here established is for a new genus, and is 

 distinct from the other two subfamilies which the writer would 

 recognize, in having three segments to the palpi and in having all 

 the legs normal, i. e. adapted for locomotion only. The large hair- 

 clasping legs of the second and third pairs found in so many of 

 the members of the Gyropidae are in this subfamily simple and in 

 no way modified for hair clasping. 



It is desired that the palpi of all species of the family be carefully 

 studied. Of those species observed by the writer all, except the one 

 going into this new subfamily, appear to have either two, or four 

 segmented palpi. 



But a single genus included. 



PROTOGYROPUS, new genus. 



Head somewhat triangular in shape, without projecting temporal 

 lobes. Prothorax broad, being almost as broad as the head and 

 meso thorax. Tarsi all very similar, first segment broader than long 

 and swollen on inner distal margin; second segment longer than 

 broad; claw simple, strongly curved near the base and sharp at 

 apex. Femora unarmed, simple, strongly curved on outer margin. 

 Dorsal setae of abdomen for the most part arranged into four 

 longitudinal rows; large lateral setae present on certain segments. 



Genotype and its host. — Protogyropus nonnalis, new species, from 

 Cavia, species, taken in Argentina. 



This genus, based on a single species, is of special interest because 

 of its evident primitive character as shown by the legs which have 

 not developed special hair-clasping devices. 



