— 50 — 



wings and from gt-n/iani/s by the pale wings, the form of prothorax 

 margin and the shorter marginal cell. 



Planiceps minor 



'+ . — Anterior margin of clypeiis in llie midtlle sligiitly incurved or siiblrun- 

 cate ; space between liind ocelli greater than that between them and the nearest 

 eye-margin, antenniv joints 3-7 about equal in length, all the nagelhim joints more 

 or less narrowed basally on under side, so that the flagcllum has the appearance of 

 being slightly serrate ; the proihorax is longer than the dorsulum and sculeilum 

 combined, its posterior margin subtruncate ; metathorax above faintly impressed 

 down the middle ; legs stout, the four hind tibiae and tarsi strongly spinose ; claws 

 armed with a strong tooth within longer spur of hind tibix' fully equal to half the 

 length of the first hind tarsal joint ; apical abdominal segments with a few long, 

 black hairs. Black, the thorax with a strong, purplish reflection ; fore wings 

 dark-fuliginous, with a strong, purple reflection, which is not to be seen on the 

 apical margins. Length, S mm. 



Southern Florida {Ro/hrtson). Differs from its ally /^ /lii^er 

 by its smaller size, the purple wings, and the much longer pro- 

 thorax and hind til)ial spur. 



Planiceps dubius 



O • — Anterior margin of the clypeus rounded ; antenna; short, stout, not 

 reaching beyond the tegula?, third joint about one-third shorter than the fourth, 

 space between the eyes at the clypeus is a little greater than the length of the first, 

 three joints of the antennre united ; posterior margin of prothorax angular, upper 

 surface of metathorax with a longitudinal medial impressed line, the posterior face 

 depressed; four hind tibia; and tarsi strongly armed with spines; longer spur of 

 the middle and hind tibia; very nearly equal in length to the first joint of their re- 

 spective tarsi ; abdomen shorter than the thorax, more compressed than depressed. 

 Hlack, the head antl thorax more or less clothed with silvery pile, which is most 

 dense on thorax beneath, upper surface of hind coxiv. the metathorax and the 

 femora, the two first dorsal segments of the abdomen are also silvery wlien viewed 

 in certain positions ; wings hyaline basally, becoming gradually darker to the apex ; 

 first recurrent nervure received by the second submarginal cell between its base and 

 middle. Length, 6.5 mm. 



Southern Florida {Roln-rfso/i). From P/. /era/is Cr., it is distin- 

 guished by its smaller size, angular prothorax, longer hind tibial 

 spurs and darker wings ; from calcaratiis Fox it will be separated 

 by the black tibial spurs, larger size and the shorter and more 

 robust antenntt. 



Cerceris Robertson ii 



. . — Middle part of clypeus with a short, (lap-like, appressed lobe, which is 

 indistinct when vietted from above, the anterior margin strongly crenulated ; head 

 coarsely punctured, the punctures strongest on cheeks and vertex, finest in depres- 

 sion behind antenna- and sparsest on face and clypeus ; third antennal joint about 



