160 PROC. ENT. SOC. WASH., VOL. 23, .NO. 7, OCTOBER, 1921 



19. (Cryptus) Compsocryptus calipterus (Say). 



Cry plus calipterus Say, Boston Journ. Nat. Hist., vol. 1, 1835, p. 234 (Leconte 



ed., vol. 2, p. 690); Cresson, Trans. Am. Ent. Soc., vol. 4, 1872, p. 158. 

 Compsocryptus calipterus Ashmead, Proc. V. S. Nat. Mus., vol. 22, 1900, p. 43. 



Cryptus fletcheri Provancher, synonymized by Provancher 

 himself with calipterus, is apparently distinct. This opinion is 

 based on notes on the type by S. A. Rohwer as well as on the 

 original description. 



Cresson's statement that the antennae of calipterus are with- 

 out an annulus is not in agreement with the original description. 

 A large series of calipterus from Mexico, Texas, and New Mexico 

 shows that this character is, however, not constant. 



Cryptus calipterus as restricted by us does not agree in all 

 respects with Ashmead's description of Compsocryptus. Ash- 

 mead included under the name, several very similar species, some 

 of which do agree with the generic diagnosis, and in our opinion 

 these are all obviously congeneric. 



20. (Cryptus) Compsocryptus ? cestus Say. 



Cryptus cestus Say, Boston Journ. Nat. Hist., vol. 1, 1835, p. 234 (Leconte ed., 

 vol. 2, p. 691). 



We are not able to identify this species in the National Col- 

 lection. It is similar to calipterus and is very likely a Compso- 

 cryptus. 



21. (Cryptus) Itoplectis conquisitor (Say). 



Cryptus conquisitor Say, Boston Journ. Nat. Hist., vol. 1, 1835, p. 232 (Leconte 



ed., vol. 2, p. 689). 



Cryptus pleurivinctus Say, loc. cit., p. 235 (Leconte ed., vol. 2, p. 691). 

 Pimp/a conquisitor Walsh, Can. Ent., vol. 2, 1869, p. 12. (First synonymizing 



of pleurivinctus with conquisitor}. 

 Ephialtes (Itoplectis) conquisitor Cushman, Proc. U. S. Nat. Mus., vol. 58, 1920, 



p. 347, fig. 1, PI. 21, fig. 2. 



Further synonymy is given in the last reference. 



22. (Cryptus) Mesochorus discitergus Say. 



Cryptus discitergus Say, Boston Journ. Nat. Hist., vol. 1, 1835, p. 231 (Leconte 

 ed., vol. 2, p. 689). 



Say's description of the abdomen of discitergus is so suggestive 

 of some species of Mesochorus that there seems little doubt that 

 it belongs to this genus. An undetermined specimen of Meso- 

 chorus in the National Collection comes very close to Say's 

 description, differing only in the extent of black on the thorax 

 and in having the basal joints of the antennae (the flagella are 

 gone) reddish. 



