ANOPLURA OF THAILAND — JOHNSON 595 



Tharua, February 1, 1952, RE-485. Three male, seven female para- 

 types from C. hadius minor, kanchanaburi: Tha Khanun, Hin 

 Laem, October 27 and 29, 1952, RE-1308 and RE-1329. 



Holotype deposited in the collections of the U.S. National Museum, 

 type-catalog No. 64388. 



Diagnosis: P. cannomydis is immediately separable from all other 

 described members of the genus Polyplax by the lack of any vestige of 

 paratergal plates on the eighth abdominal segment, by the absence of 

 plates on the abdomen, except on the genital segments and by the 

 very large and flattened tarsal claw on the third leg. 



Description: Male: Head elongate, preantennal region strongly 

 sclerotized and produced so that antennae are inserted well posteriad 

 to the head apex; guiar region apparently not raised, although a 

 lateral longitudinal fold may represent the limits of a greatly broad- 

 ened gular area; postantennal head margins slightly convex; occipital 

 region constricted; antennae normal, basal segment not enlarged and 

 third segment unmodified. Thorax broader than head and not as 

 long; sternal plate obsolescent, represented by a small area of deeper 

 pigmentation. First pair of legs small, with slender claw; second pair 

 similar and only somewhat larger; thu-d pair much larger than others, 

 with large, flattened claw. Abdomen entu-ely devoid of plates except 

 the ventral genital plate of segments 7 and 8. Ventrally with one 

 row of 2 setae on segment 2; one irregular row of 9 to 10 setae on 

 segment 3 (these setae may represent coalescence of two original 

 rows); segments 4-6 with one row of 5 to 6 setae plus 1 lateral seta 

 on each side near paratergal plates. Dorsally with 1 row of setae 

 per segment; segments 3-5 with one median row of 10 to 12 setae, 

 plus 1 or 2 lateral setae on each side; segments 6 and 7 with row of 

 11 to 14 setae; segment 8 with row of 4 setae. Paratergal plates 

 present on segments 2-7; plate II poorly sclerotized, with no apparent 

 division into two parts; plates III-VII sclerotized only apically, with 

 posterior angles rounded; each bearing two very long apical setae. 

 Segment 8 lacking paratergal plates but with spiracles and 

 usual two long lateral setae on each side below spiracle. Genitalia 

 with parameres enclosing proximal half of stout wedge-shaped 

 pseudopenis. 



Female: Head, thorax, and legs as in male. Abdomen lacking 

 plates except the genital plate of the eighth segment. Dorsally, 

 segment 2 with one row of setae; segment 3 with two rows; segment 4 

 with one row, plus 2 lateral setae on each side; segments 5-7 with 

 two rows, anterior row of 6 to 9 short setae, posterior row of 10 to 14 

 much longer setae, and with 1 or 2 setae laterafly on each side. Ven- 

 trally segments 2-4 with one row of setae; 5-7 with two rows, anterior 

 row of 2 to 5 short setae, posterior rows ol 4 to 8 longer setae; 



