8 PEOCEEDINGS OF THE NATIONAL MUSEUM. vol.64. 



Genus PROTARCHUS Foerster. 



Protarchus Foerster, Verb. Nat. Ver. Preuss. Rheinl., vol. 25, 1868, p. 201. 

 Zacalles Davis, Trans. Amer. Ent. See, vol. 24, 1897, p. 283 (not Foerster). 



No North American species has been referred to this genus. But 

 Zacalles magnus Davis belongs here. 



Head and thorax coarsely and closely punctate, especially the 

 pleura and propodeum; head also opaque shagreened; clypeus rather 

 small, transversely impressed before apex, the apex broadly emargi- 

 nate; mandibles short and stout with short equal teeth; malar space 

 distinct; frons concave, flanked on either side by a rounded tubercle 

 just above the antennae; ocelli rather large, the space between the 

 paired ones deeply impressed; temples slightly convex, sloping; 

 eyes very slightly emarginate opposite antennae; antennae stout, 

 tapering at apex; first flagellar joint about twice as long as second; 

 occipital carina complete and strong, the occiput deeply concave; 

 notauli very deep anteriorly, becoming obsolete at middle; epomia 

 absent; prepectal carina strong to about half way up the pleura; 

 scutellum convex, not margined; propodeum with apical carina 

 strong, petiolar area closed at sides and frequently with a median 

 carina, reaching nearly to middle of propodeum; other carinae 

 obsolete, the lateral represented by strong ridges separating the 

 pleural and lateral areas, the median areas indistinctly defined, very 

 narrow; spiracles large, oval; wings large; stigma long with radius 

 before middle; basal vein curved at base; nervulus strongly post- 

 f ureal and inclivous; second abscissa of radius a long sigmoid curve; 

 areolet oblique, subtriangular, usually petiolate; disco-cubitus angu- 

 late or subangulate, frequently with ramellus distinct; second recur- 

 rent with a convex curve near the top, the bulla divided, nearly 

 interstitial with the second intercubitus; nervellus reclivous, broken 

 above middle; hind legs long and stout; hind tibia and tarsus not 

 compressed; inner calcarium reaching nearly to middle of basitarsus; 

 last tarsal joint nearly as long as third and nearly twice as long as 

 fourth; claws simple; abdomen scarcely compressed, rather coarsely 

 punctate basally, subpolished apically; first tergite about half as 

 wide at base as at apex, the sides nearly straight, glymmae separated 

 by a broad basin, median carinae distinct to beyond spiracles, latter 

 at about the middle, the tergite ridged laterally but not carinate 

 beyond spiracles; second tergite with distinct rounded thyridia; 

 all tergites visible; hypopygium compressed; ovipositor briefly ex- 

 serted but not extending beyond apex; sheath broad, rounded 

 at apex. 



PROTARCHUS MAGNUS (Davis). 



Zacalles magnus Davis, Trans. Amer. Ent. Soc, vol. 24, 1897, p. 283. 

 A specimen from Francona, New Hampshire, differs from Davis's 

 description in having the vertex and thorax black, the latter with 

 yellow markings, the coxae, trochanters, and hind femur black; and 



