116 



Genus Halîctoxenos Pierce. 



H. (Halîctosiylops) nitidiusculus m. n. sp. 



Described from two female specimens taken by Mr. J. No- 

 skiewicz at Złoczów (Łysa Góra) 13. VI. 1924 as parasites of 

 Halictus nitidiusculus K. Both 99 were find in one female spe- 

 cimen of the bee. This species had been already mentioned as 

 a parasite of H. nitidiusculus K. but remained as yet undescribed. 



It was found in England (9 Smith 1859), Czechoslowakia (Slany 

 15. VI. 1923 two females taken by Mr. S. Hrabè) and Russia 

 (Poltava D. A. O g I o b 1 i n briefly communication). The only known 

 European species of Halictoxenos is H. Nassonovi Pi er ce descri- 

 bed by N. V. Nassonov in 1893 as parasite of H. minutus K. 

 from Germany and the present new species may be compared 

 with the decsription and drawings of that author. 



Female. PI. 11. Fig. 2 A. Larval céphalothorax L. 0,43 and 

 0,39 mm. Maximum breadth at spiracles 0,46 — 0"43 mm. Breadth 

 of head 0'25 — 0'27 mm; the distance from the spiracles to the 

 apex of the céphalothorax 0,35 — 0,32 mm ; the breadth of cépha- 

 lothorax of the base 0,37 — 0,32 mm. Breadth between the man- 

 dibles 0,064—0,057 mm. L. of mandibula 0,0275 mm. Br. of man- 

 dibula 0,026 mm. Larval céphalothorax light yellowish with brownish 

 spiracles and margins around of them ; the base of céphalothorax 

 narrow, a rectangular strongly chitinized band on the first abdo- 

 minal segment ventrally black, this band is emarginated on poste- 

 rior angles. Céphalothorax constricted at the base, widest at 

 spiracles thence oblique, slightly convex to mandibles, rounded 

 at sides with rounded truncate apex. Spiracles lateral, but not 

 prominent. Mandibles not reaching the lateral margin ; bluntly 

 bilobed at the apex with broad base. Fig. 2. B. 



The mouth orifice leads in a short chitinized tube slightly 

 narrowed to internal end. The genital orifice like a curved slit 

 with thickened margin laterally not reaching the edge of the 

 céphalothorax (I think this may be a good generic character, as 

 was already pointed out by N. Nassonov 1893 p. 96). „This 

 slit is situated on the border between the cephalic and thoracal 

 parts of céphalothorax and is bow shaped as in the forms pre- 

 viously investigated (Xenos, Stylops) pi. fig. 12, but to the con- 

 trary of what is obserwed in those is does not reach the lateral 



