PROC. ENT. SOC. WASH., VOL. 22, NO. 3, MAR., IQ2O 57 



of clypeus, inner eye margins narrowly, a spot above each antenna, neck, 

 spot on each anterior dorsal corner of pronotum, posterior margin of pro- 

 notum narrowly, tegulae, spot on scutellum, metanotum medianly, spot on 

 mesepisternum below tegula, elongate spot on posterior lateral angles of 

 propodeum, a broad narrowly interrupted band on first tergite, lateral spots 

 on second tergite, anterior margin of third, fourth and fifth tergites (emargin- 

 ate posteriorly), and lateral spots on second, third and fourth sternites, yellow; 

 legs black, dorsal and ventral spots on hind coxae, and more or less of apices 

 of all the femora yellow; tibiae and tarsi yellowish ferrugineous; wings hyaline 

 with a dusky tinge, the apical anterior margin distinctly dusky ; venation dark 

 brown; hair yellowish. 



In the paratype there are the following additional yellow marks : 

 a small spot above the tegula, a spot on posterior margin of mes- 

 episternum, a spot on side of propodeum, most of four posterior 

 femora, dorsal aspect of metapleurae. 



Type locality. Inverness, Florida. One female collected by 

 Charles Robertson and under his number 25052. One fema 1 e from 

 Virginia Beach, Va., collected Aug. 31, 1903, by E. S. G. Titus. 



Type. Cat. No. 22611, U. S. N. M. 



Lindenius robertsoni, new species. 



Because of the simple mandibles this species runs directly to 

 Lindenius in Ashmead's classification and placing generic impor- 

 tance on this character would make it necessary to place it there. 

 In Fox's arrangement, however, the species runs best to planipes 

 Fox but differs from that species in many important characters. 

 The species is excluded from "group pinguis" as defined by Fox 

 in the flattened fore tarsi and absence of a pygidium. It seems 

 very likely that the males of Lindenius, as defined by having the 

 mandibles simple at apex, will possess a wider range of characters 

 than allowed in the definition of this group by Fox. 



Male. Length, 4.5 mm. Anterior margin of the clypeus armed with four 

 obtuse teeth of nearly equal size; shortest distance between the eyes about two- 

 thirds the length of the scape; upper margin of the frontal depression defined by 

 a sharp carina from the anterior ocellus; area immediately above the carina 

 defining the frontal depression coarsely reticulate-punctured; supraorbital 

 fovea obsolete; vertex and cheeks shining, almost without sculpture; occiput 

 with a strong carina which is foveolate in front, cheeks not dentate ; scape 

 somewhat flattened and broader apically; flagellum short, stout, about one 

 and one-half times as long as scape, the first joint slightly produced apically 

 beneath, second and third joints somewhat narrower so at first sight tin- 

 flagellum seems emarginate at the base beneath, joints four and five slightly 

 produced beneath; anterior margin of the pronotum carinate, not dentate 

 laterally; prothoracic tuberculc carinate anteriorly so when seen from above 



