112 BULLETIN 66, UNITED STATES NATIONAL MUSEUM. 



Length of body, 1.75 mm.; breadth of head, 0.5 mm.; length of an- 

 tennae, 1 mm. ; length of elytra, 0.4 mm. ; expanse of wings, 3 mm. 

 (Edeagus near apex bent back into an acute process." 



7. HALICTOSTYLOPS, new genus. 



The genus is parasitic on the Andrenid genus Halictus and in the 

 present sense occurs in Europe. 



This genus name may be spoken of as a transitional name. That 

 is, it is proposed to contain the species Halictophagus spencii Nasso- 

 now (1893 a) until the proper resting place of that species may be 

 ascertained. The genus will undoubtedly hold its rank because of 

 the great dissimilarity between this species and Halictoxenos craw- 

 fordi. The location of the genus however is dubious. The female 

 has the aspect of a Stylops and yet Halictoxenos is a xenid. It 

 would be strange indeed if the parasites of the halictine series should 

 fall part in Stylopidae and part in Xenida?. 



Female. — Cephalothorax triangular from stigmatal angles, nar- 

 rowly truncate at apex; mandibles marginal. Stigmata not lateral. 

 Abdomen with five median genital tubes on the second to sixth seg- 

 ments (Nassonow, 1893 b). 



Triungulinid : Similar in form to that of Stylops. Tenth abdominal 

 segment short, triangular, with two ventral tubercles as long as seg- 

 ment and each bearing a long stylet (Nassonow, 1893 b). 



i. HALICTOSTYLOPS SPENCII Nassonow (1893). 



Halictophagus spencii Nassonow, 1893 a. 

 Halictophagus curtisii Nassonow 1893 b. 



The species is parasitic on Halictus minutus Kirby, and occurs in 

 England and on the continent of Europe. 



This name was given in error, but was accompanied by an illus- 

 tration, which is technically a description. The genus Halictophagus 

 is composed of homopterous parasites, by a strange error in assump- 

 tion of evidence. 



a Male. — Kopf matt schwarzbraun, Ftihler graubraun, die 3 ersten Glieder sehr kurz, 

 die 3 folgenden bedeutend langer, das 4te Glied etwas langer als das 6te, das 5te nur 

 halb so lang als letzteres. Mandibel und Taster dunkelbraun, Thorax dunkelbraun, 

 an den N ah ten und am Rande heller, ins Gelbbraune ziehend. Hinterleib dunkel- 

 braun, desgleichen Bauch und Hypopygium. Vordere Hiiften dunkelbraun; Hinter- 

 hiiften braungelb mit dunkelbrauner Spitze; vorder Schenkel braungelb, unten dunk- 

 ler, Hinterschenkel braun, Schienen schwarzbraun, die Tarsen oben am Wurzelteil der 

 Glieder schwarzbraun, im Ubrigen weiss. Elytren schwarzbraun, etwas keulenformig. 

 Fltigel namentlich am Vorderrande etwas graulich, das Geader schwarzbraun, die 

 Adern fast bis zum rande verlaufend ; der Vorderrand an der Wurzelhalf te dick, dunkel ; 

 fur das Geader vergleiche man Fig. 10. Korperliinge 1.75 mm., Kopfbreite 0.5 mm., 

 Fiihlerlange 1 mm. ; Lange der Elytren 0.4 mm. ; Fliigelspannung 3 mm. Die Genitalien 

 sind schwer sichtbar, aber der Hauptsache nach wie bei Halictophagus, an der Spitze 

 findet sich ein zuruckgeschlagener, fast gerader dornformiger Fortsatz (Meijere, 

 1908). 



