108 BULLETIN 66, UNITED STATES NATIONAL MUSEUM. 



considerably longer than broad, more or less convex on all sides, 

 apically convexly truncate; truncation one-fourth the breadth at 

 the spiracles. Mandibles rounded, obtuse, with acute curved tooth 

 at apex and slightly rounded elevation at middle of outer edge. 

 Spiracles reaching a little beyond lateral margin. 

 Type— Cat. No. 10099, U.S.N.M. 



28. STYLOPS SPARSIPILOSjE, new species. 



Host. — Andrena sparsipilosa Viereck (paratype); Waldoboro, 

 Maine, July 12, 1898. Described from female from the collection 

 of H. L. Viereck (pi. 4, fig. 7). 



Female. — Length of cephalothorax 0.72 mm., breadth of spiracles 

 0.77 mm., breadth at base of head 0.46 mm., distance between 

 mandibles at base 0.10 mm. Cephalothorax light yellowish brown 

 with a darker brown band at base; not as long as broad, squarely 

 truncate at apex; truncation less than one- third the breadth at the 

 spiracles. Lateral margin convex. Mandibles broadly, convexly 

 quadrate. Spiracles lateral but not prominent. 



Type.— Cat. No. 10100, U.S.N.M. 



2g. STYLOPS SUBCANDIDjE, new species. 



Host. — Andrena subcandida (det. H. L. Viereck) ; Southern Cali- 

 fornia. Described from three females and many triungulinids (pi. 4, 

 fig. 8). 



Female. — Length of cephalothorax 0.75 mm., breadth at spiracles 

 0.77 mm., breadth at base of head 0.47 mm., distance between 

 mandibles at base 0.10 mm. Cephalothorax light brownish, with 

 narrow slightly darker band at base, half on thorax and half on 

 abdomen; about as long as broad, truncate at apex; truncation 

 almost one-third the breadth at the spiracles. Lateral margin sinu- 

 ately convex. Mandibles obtusely rounded, with small acute curved 

 tooth near apex. Spiracles dorsal, just reaching lateral margin. 



Triungulinid: Length of body 0.19 mm., length including stylets 

 0.23 mm., breadth of head 0.04 mm., greatest breadth 0.06 mm., 

 breadth of ninth abdominal segment 0.03 mm. 



The characters are essentially the same as those described for 

 Stylops californica. 



Type.— Cat. No. 10101, U.S.N.M. 



30. STYLOPS SWENKI, new species. 



Xenos (?), species, Pierce, 1904, p. 17. 

 Host. — Andrena solidaginis Robertson; Lincoln, Nebraska, Sep- 

 tember, August 18, 19, 30, 1903. Also collected at Collingdale 

 (Delaware County), Pennsylvania, August 31. Described from three 

 females and multitudes of triungulinids collected at Lincoln by Mr. 

 Swenk and the writer. 



