150 BULLETIN 66, UNITED STATES NATIONAL MUSEUM. 



3. HALICTOXENOS GR/EINCHERI, new species. 



This species is named in honor of Dr. Sigmund Grasnicher, of Mil- 

 waukee, Wisconsin, who collected two male Halictus (Chloralictus) 

 albipennis Robertson on August 4, 1906, each bearing a female of this 

 species (pi. 12, fig. 2). 



Female. — Length of cephalothorax 0.57 mm., breadth at spiracles 

 0.57 mm., breadth of head 0.30 mm., distance between mandibles 

 0.07 mm. Cephalothorax light yellowish brown, the dark-brown area 

 of the brood canal extending over the base of the thorax; truncate 

 pyramidal, constricted at base, widest behind spiracles, thence nar- 

 rowing obliquely to mandibles with a slight emargination at the base 

 of the head; spiracles lateral but not prominent; mandibles near 

 lateral margin, transverse, emarginate at apex. 



Type.— Cat. No. 10107, U.S.N.M. 



4. HALICTOXENOS VERSATI, new species. 



Host. — Halictus (Chloralictus) versatus Robertson; one female bee, 

 Milwaukee, Wisconsin, September 1, 1906 (containing one female); 

 one female, September 10, 1906 (containing one female); and one 

 female, September 22, 1906 (containing three females); S. Graenicher, 

 collector (pi. 12, fig. 4). 



Female. — Length of cephalothorax 0.53 mm., breadth at spiracles 

 0.51 mm., breadth of head 0.26 mm., distance between mandibles 

 0.05 mm. Cephalothorax yellowish brown, with brown band at base; 

 triangular with rounded truncate apex, strongly constricted at base, 

 widest behind spiracles, thence oblique, slightly convex to mandibles 

 with shallow concave emargination at base of head, apex convex; 

 spiracles lateral, but not prominent; mandibles bluntly triangular, 

 with broad base. 



Type. — Temporarily in possession of author. 



5. HALICTOXENOS ZEPHYRI, new species. 



Host. — Halictus (Chloralictus) zephyrus Smith; Milwaukee, Wis- 

 consin, September 12, 1903; S. Graenicher, collector. 



Female. — Length of cephalothorax 0.54 mm., breadth at spiracles 

 0.56 mm., breadth of head 0.24 mm., distance between mandibles 

 0.068 mm. Cephalothorax yellowish brown, with a dark band at base; 

 truncate pyramidal, constricted at base, widest at spiracles, thence 

 oblique and almost straight to mandibles, apex rounded at sides, 

 squarely truncate in front; spiracles not laterally prominent; man- 

 dibles broad at base, armed with blunt tooth at inner angle. 



Type.— Cat. No. 10110, U.S.N.M. 



6. HALICTOXENOS SPARSI, new species. 



Host. — Halictus (Chloralictus) sparsus Robertson; Ardmore, Okla- 

 homa, April 12, 1907; F. C. Bishopp, collector (pi. 12, fig. 3). 



