1903.] NATURAL SCIENCES OF PHILADELPHIA. 303 



bearing a series of folds or plaits, which are generally disposed in rows 

 of four on each side, these being most numerous anteriorly and vanishing 

 posteriorly. Ventral surface of the abdomen wth the segments 

 apically with small nodes, somewhat like the folds of the dorsal surface, 

 but these being very irregularly distributed. Such folds and nodes 

 are, in many cases, set with stiff bristles. Anal segment not very long, 

 rather broad, the surface almost flat; median sulcus very broad and 

 shallow. Forceps of medium length, rather robust, triangular in 

 section, the left exceeding the right in length; internal margins not 

 toothed, almost straight. Femora short and robust; tibiae rather 

 compressed, heavy, shorter than the femora in the posterior and 

 median pairs, equal in the anterior pair. 



General color blackish-brown; labrum, portions of clypeus and man- 

 dibles, tibise and tarsal joints dirty yellow (gamboge); femora of the 

 general color becoming suffused with yellowish apically; antennae 

 wood-brown, the apical portion of basal joint washed with dull- 

 yellowish. 



Measurements. 



Total length, 13.5 mm. 



Length of pronotum, 2.0 " 



Width of pronotum, 2.0 " 



Length of forceps, 3.0 " 



Length of anal segment, 1.5 " 



Anterior width of anal segment, 2.7 " 



Psalis pulchra n. .^p. 



Type:c?; San Carlos, Costa Rica. (Schild and Burgdorf.) [L'. S. 

 N. M.] 



This species is apparently closest allied to P. americana and gaga- 

 thina, both of which very considerably surpass it in size, and from 

 which it differs in the more elongate pronotum, the comparatively 

 heavier forceps and different coloration. Relationship appears to 

 exist with P. rosenhergi Burr from Ecuador, but pulchra may readily 

 be separated by color as well as the non-pilose body. 



Body of medium size (for the genus) ; elongate fusiform ; surface 

 moderately polished. Head broader than the pronotum; antennae 

 15 to 16-jointed, third joint shorter than the basal, fourth and fifth 

 rather small and rounded, sixth to eighth elongate, increasing in size, 

 ninth to extremity equal to the eighth in size and shape — the apical 

 portion of each segment being enlarged and of considerable greater 

 size than the base. Pronotum longer than broad and slightly con- 

 stricted posteriorly; anterior margin subtruncate, the posterior roundly 

 produced centrally, lateral margins considerably deflected upward ; 



