570 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.40. 



Family TRYPOXYLONID^. 

 Genus PISON Spinola. 



PISON CRESSONI, new species. 



Perhaps closest to conformis Smith, but differs in many important 

 points from the description of that species. 



Male. — Length 10 mm. Anterior margin of clypeus with three 

 obtuse teeth, the middle one broader and truncate, the lateral ones 

 rounded; false margin of clypeus wavy; space between the eyes at 

 the clypeus somewhat greater than the space between them at the 

 vertex; furrow from anterior ocellus slightly indicated; postocellar line 

 subequal with ocellocular line; a faintly depressed, transverse area 

 behind lateral ocelli; head, including clypeus to false margin, finely 

 granular; antennae thickened apically, first joint of flagellum longer 

 than second; mesonotum with close, small distinct punctures; scutel- 

 lum with larger and sparser punctures; propodeum not channeled and 

 with the punctures somewhat more widely separated than those on the 

 dorsulum; posterior face with the usual median channel, the lowest 

 part faintly striated ; propodeum laterally shining, with small, separate 

 punctures; legs without spines; abdomen punctured like mesonotum, 

 narrow apical margin of basal segments depressed. Black; three 

 basal antennal joints ferruginous; tegulae and tubercles brownish; 

 with the exception of the sides of propodeum the insect is clothed 

 with fuscous pile, the pile more evident on the orbital margins and 

 propodeum dorsally. Costal margin of wings and area before basal 

 nervure dark fuscous, the rest of the wings subhy aline; venation brown, 

 stigma paler. 



San Antonio, Nicaragua. Two males collected May, 1899. 



Type— Cat. No. 13752, U.S.N.M. 



Named after Mr. E. T. Cresson. 



Family LARRID^. 

 Genus TACHYSPHEX Kohl. 



TACHYSPHEX HELIANTHI, new species. 



In Fox's table to the Nearctic species of Tachysphex this species 

 runs in with ampins Fox, but it is quite different from any species 

 of this section. It may be easily separated from the described 

 species by the long antennae, coarse sculpturing, and small size. 



Female. — Length 6 mm. Clypeus rounded out medianly, the 

 lateral angles obtuse, apical part shining, with large widely sepa- 

 rated punctures, basal part with small close punctures; mandibles 

 with two blunt teeth near inner middle; front with close, rather 

 small, well-defined punctures, the punctures of the vertex sparser; 



