604 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 92 
(Tetrapaedia DALLA Torre) for Tetrapedia Kive. 
Catalogus hymenopterorum, vol. 10, p. 299, 1896. 
Tetrapedia Ktuc (=Tetrapedium Brrrnotp; Tetrapaedia Datta Tore). 
Mag. Ges. naturf. Freunde Berlin, vol. 4, p. 33, 1810. 
Type—Tetrapedia diversipes Kiva, 1810. (Monobasic.) 
(Tetrapedium BrrryHorp) for Tetrapedia Kivu. 
Latreille’s natiirliche Familien des Tierreichs, p. 468, 1827. 
Tetraperdita CoCKERELL AND PORTER. 
Ann. Mag. Nat. Hist., ser. 7, vol. 4, p. 414, 1899. 
Type—Perdita sexmaculata CocKERELL, 1895. (Monobasie and original 
designation. ) 
Proposed as a subgenus of Perdita F. Smith. 
Thalestria F. SMITH. 
Catalogue of hymenopterous insects ... British Museum, pt. 2, p. 283, 1854. 
Type.—Thalestria smaragdina F. SmirH, 1854. (Monobasic.) 
Thaumatosoma I. SMITH. 
Trans. Ent. Soe. London, ser. 3, vol. 2, p. 394, 1865. 
Type—Thaumatosoma duboulaii F. Smirs, 1865. (Monobasic.) 
Thoracobombus DALLA TORRE. 
Die Naturhistoriker, vol. 2, p. 40, 1880. Five species. 
Type.—Apis sylvarum LInNAEus, 1761. (Present designation.) 
Proposed as a subgenus of Bombus Latreille. 
Thrausmus BUYSSON. 
Ann. Soc. Ent. France, vol. 69, p. 177, 1900. 
Type—Thrausmus grandidieri Buysson, 1900. (Monobasic.) 
Thrinchostoma SaussurE (=Trichostoma, Thrincostoma DAtiA Torre; Trin- 
chostoma SLADEN). 
In Grandidier, Hist, Nat. Madagascar, vol. 20, Hymen., pt. 1, p. 52, 1890. 
Type.—Thrinchostoma renitantely SAUSSURE, 1890. (Monobasic.) 
(Thrincostoma Datta TorRE) for Thrinchostoma SAUSSURE. 
Catalogus Hymenopterorum, vol. 10, p. 641, 1896. 
Thygater HOLMBERG. 
Actas Acad. Nac. Ciene. Cérdoba, vol. 5, p. 188, 1884. 
Type.—Tetralonia terminata F. SmirH, 1854. (Monobasic.) 
Thygatina COCKERELL. 
Trans. Amer. Ent. Soc., vol. 37, p. 237, 1911. 
Type.—Thygatina fumida CoCKERELL, 1911. (Monobasic.) 
Thyreothremma Hotmpere (=Thyreotremata HoLMBERG, nomen nudum). 
Anal. Mus. Nac. Buenos Aires, ser. 3, vol. 2, p. 291, 1903. Three species. 
Type.—Thyreothremma rhopalocera Hormpere, 1903. (Present designa- 
tion. ) 
Thyreotremata HoLmberc, (nomen nudum)=Thyreothremma HOLMBERG. 
Bol. Acad. Nac. Ciene. Cérdoba, vol. 10, p. 225, 1887. 
Thyreus PANzER (=Crosica JURINE, 1801; Crocissa PANzER, 1806). 
Kritische Revision der Insektenfaune Deutschlands . . ., vol. 2, p. 263, 1806. 
Type.—Nomada scutellaris Fasrictus, 1781. (Monobasic.) 
Isogenotypic with Crocissa Panzer. 
As a result of the suppression of the “Erlangen List” Thyreus Panzer replaces 
Crocisa Jurine, 1801, as Panzer (1806) synonymized Crocissa Panzer with 
Thyreus. Dalla Torre’s procedure of placing Thyreus Panzer, 1806, as a 
synonym of Orocisa Jurine, 1807, Catalogus Hymenopterorum, vol. 10, p. 
319, 1896, cannot be followed. 
Titusella COCKERELL. 
Bull. Amer. Mus. Nat. Hist., vol. 22, p. 445, 1906. 
Type.—Titusella pronitens CocKERELL, 1906. (Monobasic.) 
