30 Harry Scott Smith 
3. Front with a longitudinal carina above antennae; entire dorsal 
surface of first abdominal segment black........... rufozonalis 
Trypoxylon albitarse Fabricius. 
1804. Trypoxylon albitarse Fabricius, Systema Piezatorum, p. 180. 
1893. Trypoxylon albitarse Fox, Proceedings of the Academy of Nat- 
ural Sciences of Philadelphia, p. 474. 
I have before me eight specimens of this large black species, ~ 
both sexes, bred from the nests taken at Nebraska City and Lin- 
coln. The insects emerged in March and in May. 
Trypoxylon frigidum F. Smith. 
1856. Trypoxylon frigidum F. Smith, Catalogue of Hymenoptera in 
the British Museum, iv, p. 381. 
1893. Trypoxylon frigidum Fox, Proceedings of the Academy of Nat- 
ural Sciences of Philadelphia, p. 472. 
A single male from Glen seems to be this species; it was taken 
August 13, 1906 (H. S. Smith). I have also a related species 
which is evidently new, but is in too poor condition to be described 
without more material at hand. 
Trypoxylon texense Saussure. 
1867. Trypoxylon texense Saussure, Reise d. Novara, Zoology, ii, 
Hymenoptera, p. 77. 
1893. Trypoxylon texense Fox, Proceedings of the Academy of Nat- 
ural Sciences of Philadelphia, p- 475. 
One female, Glen, August; two females, Culbertson, August. 
Trypoxylon tridentatum Packard. 
1867. Trypoxylon tridentatum Packard, Proceedings of the Entomo- 
logical Society of Philadelphia, vi, p. 417. 
1893. Trypoxylon tridentatum Fox, Proceedings of the Academy of 
Natural Sciences of Philadelphia, p. 472. 
Numerous specimens from Glen, August, 1906. 
Trypoxylon rufozonale Fox. 
1891. Trypoxylon rufozonalis Fox, Transactions of the American En- 
tomological Society, xviii, p. 137. 
1893. Trypoxylon rufozonale Fox, Proceedings of the Academy of 
Natural Sciences of Philadelphia, p. 472. 
A pair dug from their nest, a hole in a clay bank, Glen, August 
13, 1906 (H. S. Smith). This nest was provisioned with twenty- 
two spiders. 
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