300 [September 



This and the three preceding species are remarkably similar in their 

 general appearance, but may be readily distinguished by the following 

 characters : — 



C. amer-icamts has the antennfe very slender, except the basal joint, 

 and entirely black, the 6th joint about 4th the length of the 3rd ; the 

 face just beneath the antennae has a small, obtuse, rounded tubercle ; 

 the clypeus is small and rather prominent ; the mesothorax has two 

 deeply impressed lines ; the areolet of the wings is 5-angular or sub- 

 triangular ; the legs are almost entirely black ; the abdomen is shining, 

 but not polished, and the ovipositor is about as long as the abdomen. 



C persimilis has all the characters of atnericanus, except that the 

 legs are mostly rufous instead of black. 



C. limatus is more robust; has the antennae much stouter and annu- 

 lated, the 6th joint nearly as long as the 3rd; the face broader, shorter 

 and without the frontal tubercle; the clypeus is twice as large and not 

 prominent, but broadly rounded in front ; the mesothorax has no deeply 

 impressed lines ; the areolet of the wings is almost quadrate ; the meta- 

 thorax has two transverse carinse; the legs are almost entirely black, 

 but shorter ; the abdomen is ovate, more robust, highly polished, the 

 basal segment flattened and suddenly quadrate at tip, and the ovipositor 

 is very short. 



C. similis has all the characters of limatus, except that it is smaller, 

 less robust, the antennae rather longer, more slender and the joints 

 longer, the legs mostly rufous, the posterior tarsi broadly annulated 

 with white, the basal segment of the abdomen more linear and the ovi- 

 positor longer. 



15. Cryptus albitarsis, n. sp. 



Black, densely sculptured; most of legs and abdomen except tip, rufous; 

 posterior tarsi white ; wings subhyaline. 



Male. — Robust, black, densely sculptured, slightly pubescent ; head 

 densely punctured, face flat, clypeus shining, palpi fuscous; antennae 

 about as long as the body, rather slender, black, 2nd joint beneath and 

 extreme base of the 3rd, rufous, the joints rather indistinct, the 3rd 

 longest, 4th shorter and subequal with the two or three following joints. 

 Thorax finely and densely rugose, somewhat shining ; mesothorax 

 densely punctured, the dorsal lines not well impressed ; scutellum flat, 

 punctured; metathorax more coarsely rugose, somewhat reticulated, a 



