418 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxi. 



with exc/siiK in some of these measurements and with h!foveolatum in 

 others. As it is very possible that I have not seen this species 1 place 

 it here. 



SPHEX INSTABILIS Smith. 

 Si>h<:f InsldhilisHMiTU, Cat. Hyin. Brit. ]\Ius., IV, 1S56, p. 263. 



This description is suggestive of an hodovtin in some regards, and I 

 have wondered if it could be C. en-omatuvi. The locality given is 

 "North America." 



SPHEX MIXTA Fabricius. 



Sj)lie.r tiii.rta Farricius, Ent. Syst., IV, 17!)4, p. 457. 



SPHEX NEOXENUS Kohl. 



SpJie.v neoxenus Kohl, Ann. natur. Hofmus. Wien, V, 1890, p. 863. 



Kohl expresses doubt as to the correctness of the locality given on 

 his specimen of this insect (Vancouver Island), as it looks to him 

 more like a South American form. In a collection of Sj^heddce from 

 Argentina, which I have had the opportunity to study, are specimens 

 which come nearer this species than any other, differing from it 

 mainlv in the amount and distribution of the color. I am therefore 

 inclined to indorse KohTs opinion and regard this as a South Ameri- 

 can species. 



SPHEX OPACA Dahlbom. 



Sphex (>}taca'D\\u.W)).i, Hyni. Eiir., I, 1845, p. 437. 

 This may possibly ])e C. fav/tarsis. It is from "Americ. merid." 



SPHEX PETIOLATA Drury. 



Sphex petiolata Drury, 111. Nat. Hist., II, 1773, p. 75, pi. xxxix, fig. 7. 

 From Jamaica. Apparently a Slcellphron. 



SPHEX SINGULARIS Smith. 



Sphex singularis Smith, Cat. Hym. Brit. Mus., IV, 1856, p. 261. 



It is possible that an examination of the type of this species would 

 show it to be the same as O. spinigei\ though this can not be demon- 

 strated from the description. It is from Honduras. 



SPHEX SINGULARIS Cameron. 



Sphex .vngularis C.\mer()N, Biol. Centr.-Ainer. Hym., II, 1889, p. 33, pi. in, 

 figs. 7, 7a. 



From Mexico, (xuatomala, Honduras, and Panama. Is it the same 

 us the last^ 



PEPSIS T Palisot Beauvais. 



Pepsu T Pai.isot Beauvais, Ins. rei-. en Afr. and Ainer., Hym., 1805, }). 117. 

 Sjiliex T Smith, Cat. Hym. Brit. JNIus., IV, 1856, p. 260. 



