4RT. 20. STUDIES OF THE BITING LICE — EWING. 25 



as long as cement cup; cement cup embracing less than a third of tlie 

 t'gg surface. 



Length of egg, 0.62 mm. ; width, 0.35 mm. 



Type host and type locality. — Aotes hoUinensk from Bolivia. 



Type.— C&t. No. 23754, U.S.N.M. 



The descriptions here given, based on the last nymph and egg, 

 would not, under ordinary conditions, be offered for a new species. 

 However, the occurrence of a species of Gyropidae on a primate host 

 is such an unexpected thing, and the evidence of its breeding on and 

 infesting the monkey host is so conclusive, that the description of the 

 species from a nymph seems justified. One specimen in good con- 

 dition on skin oi Aotes boliviensis (Cat. No. 3335, U.S.N.M.) taken 

 in Bolivia by W. E. Moore some time before 1859. Locality not 

 known but evidently from a tropical forested region. Not only was 

 the louse found deep in the fur of the skin, but several nits were 

 present, indicating the normal reproduction of the species on the 

 monkey host of the family Cebidne. 



MACROGYROPUS, new genus. 



Tarsus I provided with two claws. Femur II and III each pro- 

 vided with a forked and furrowed tenaculum for holding tarsus. 

 Tarsus II and III each with second segment greatly elongated 

 and transversely furrowed and with the claw proper, which is 

 greatly reduced, forming a clawlike structure adapted for fitting into 

 femoral tenaculum. Tibia I with a row of toothlike setae on a 

 swollen or thumblike expansion at the inner distal margin. Abdomen 

 oval, typically each segment with one transverse row of setae. Sex- 

 ual dimorphism slight or wanting. 



Genotype and its host species.— Macrogyropiis dentatus. new 

 species from Pecari angulatus crusnigrum (Chiriqui collared 



peccary). 



The two species included in this genus, M. dentatus^ new species, 

 and M. dicotylis (Macalister), are from American hogs or peccaries. 

 They are both very large species, being much larger than the others 

 of the family Gyropidae. 



KEY TO THE SPECIES OF MACROGYHOPIJS. 



0.' Tibia I with a swelling on the inside distally which is not thuniblike and 

 which is provided with a longitudinal row of tt)othlike setae; U-ngth not 

 over 3 mm M. dentatus, new species. 



a ' Tibia I with a prominent thumblike process on its inner distal aspect ; h>ngth 

 of species over 3.5 mm . M. dicotylis (Macalister) 



