244 PROCEEDINGS OF THE NATIONAL MUSEUM vol.84 



Cresson, usually interpreting the genus correctly, described 15 

 species: abdominals, affinis, caeruleus, consimUis, decoloratus, fasci- 

 pennis, flavipennis, flamtarsis, niger, obscurus, rvfipes, and scutellaris, 

 all from Colorado, in 1865; bioculatus, from Texas, in 1872; and 

 maurus and zelotypus, from California, in 1878. Finding maurus 

 and Jlavitarsis preoccupied, Dalla Torre (1901) renamed them deutero- 

 maurus and cressonii, respectively. 



In 1873 Walsh described Exetastes suaveolens and Leptobatus illinoi- 

 ensis. The latter was transferred to Exetastes by Cresson in 1877. 



In 1874 Provancher described rufus and albitarsis, later transferring 

 rufus to Ceratosoma, under which genus, renamed Ceratogasira by 

 Ashmead, it stands in Dalla Torre's "Catalogus Hymenopterorum"; 

 in 1877, rujojemoratus; in 1879, brevipennis, davatus, and matricus, 

 later synonymizing brevipennis with Mesostenus promptus Cresson; 

 and in 1883, Campoplex niger, the involved nomenclatorial relation- 

 ship of which to Exetastes will be discussed in detail under suaveolens 

 Walsh. Into this nomenclatorial tangle, because of the obvious 

 mislabeling of a specimen of suaveolens as Campoplex niger Provancher, 

 comes Exetastes provancheri Dalla Torre (1901), a name proposed to 

 replace the preoccupied combination Exetastes niger (Provancher). 

 In 1886 Provancher published Banchus caudatus, which Davis (1894) 

 properly transferred to Exetastes. A misidentification by Provancher 

 of Arenetra rujipes Cresson as Exetastes niger Cresson, later corrected 

 by Provancher himself, brings A. rufipes into the nomenclatorial 

 picture as the third species to be mentioned under the name Exetastes 

 niger. 



In 1898 Davis described his Exetastes abbreviatus, E. exploratus, and 

 Rhimphalea brevicorpa, the last of which I find synonymous with one 

 of Cresson's species of Exetastes. 



In 1910 Viereck published the nomen nudum, Exetastes propinquus 

 Cresson. 



SPECIES ERRONEOUSLY REFERRED TO EXETASTES 



(Exetastes abbreviatus Davis) =Xenoschesis cinctivbntris (Ashmead), new combination 



Colpotrochia? cinctiventris Ashmead, Trans. Amer. Ent. Soc, vol. 23, p. 200, 



1896; male (not female as given in description). 

 Homobia cinctiventris (Ashmead) Davis, Trans. Amer. Ent. Soc, vol. 24, p. 278, 



1897; male (not female). 

 Exetastes abbreviatus Davis, Trans. Amer. Ent. Soc, vol. 24, p. 366, 1898; male. 



New synonymy. 

 Xenoschesis slossonae Cushman, Proc. Ent. Soc. Washington, vol. 17, p. 140, 



1915; female. New synonymy. 



(Exetastes brevipennis Provancher) = Mesostenus promptus Cresson 



I have already discussed this synonymy (Proc. U. S. Nat. Mus., 

 vol. 74, art. 16, p. 46, 1929). 



