374 DR. K. JORDAN AND HON. N. C. ROTHSCHILD OX 



stylet are long, the one placed near the ventral edge (side-view) 

 being exceptionally long. 



Length (mounted specimens) 2*5 to 3'2 mm. 

 , Three males and one female from Old Tau-chow, Kansu, 9000 ft., 

 o& Marmota rohusta M.-Edw. 



4. Ceratophyllus crassus, sp. n. (Text-fig. 111.) 

 The only specimens (two females) which we have were in the 

 same tube as the specimens of C. dolahris, being found on the 

 same host, presumably on the same individual of the host. They 

 resemble the female of C. dolahris, but are much more hairy and of 

 stronger build. 



Head. — The frons bears a row of three bristles before the eye, 

 tlie upper two standing ra.ther close together and there being a 

 fourth bristle in front of the ventral one of the row. The occiput 

 bears a moderately long bristle above the antennal groove, about 



10 small hairs along the groove, one of them being longer and 

 thicker, and the usual subapical row. The two lower bristles of 

 this row are large and there is a wide interspace between them 

 and the next bristle of the row. The bristles of the second 

 antennal segment are long, at least five of them reaching the 

 apex of the club. The frontal tubercle is prominent. The 

 maxillary palpus extends to near the apex of the fore coxa, 

 Avhile the rostrum reaches far beyond the trochanter, the apex 

 of the fourth segment being on a level with the base of the 

 trochanter. 



Thorax. — The pronotal comb consists of 20 to 23 spines. The 

 meso- and metanotum bear each two rows of bristles. The 

 bristle-like spines on the inner surface of the mesonotum are 

 very numerous (14 to 16 on the two sides together-). 



Abdomen. — Thetergites bear three rows of bristles, the anterior 

 row being more or less irregular, the second reaching down to the 

 stigma and the third row having 2 or 3 bristles placed below the 

 stigma. The tergites I to lY or Y bear apical spines like the 

 metanotum, the numbers on the two sides together being 4 — 5 

 to 7 — 4 to 6 — 2 to 5 — or 1. The edges of the tergites are 

 irregularly excised dorsally, but do not show any distinct minute 

 serration as is usually the case in the allied forms. There are 

 three antepygidial bristles (broken in our two specimens). All 

 the sternites have additional bristles in front of the usual 

 posterior row, the numbers of bristles being as follows on the two 

 sides together (the first number referring to the additional 

 bristles of each segment) : 5 or 6, 6 to 8 — 19 to 21, 16 or 17 — 22 

 to 24, 15 to 17—22 to 26, 14 to 16—22, 15—18 to 22, 19. 



Legs. —The hind femur bears on the outside a row of 5 or 6 

 bi-istles and on the inside a i-ow of 11 or 12. The hind tibia, has 



11 lateral bristles on the outside and 8 on the inside. Two of 

 the bristles of the second hind-tarsal segment reach beyond the 

 apex of the third. The fourth segment in all tarsi is only one- 



