52 Harry Scott Smith 
Lyroda triloba Say. 
1837. Lyrops (Lyroda) triloba Say, Boston Journal of Natural His- 
tory, 1; p. 32: 
1859. Lyrops (Lyroda) triloba Say, Leconte edition, ii, p. 755. 
1893. Lyroda triloba Fox, Proceedings of the Academy of Natural 
Sciences of Philadelphia, p. 533. 
A single female specimen of this fine species was taken at Lin- 
coln during August, on Euphorbia marginata (W. D. Pierce). 
Lyroda subita Say. 
1837. Lyrops (Lyroda) subita Say, Boston Four of Natural His- 
tory, 1, p. 372. 
1859. Lyrops (Lyroda) subita Say, Leconte edition, ii, p. 755. 
1893. Lyroda subita Fox, Proceedings of the Academy of Natural 
Sciences of Philadelphia, p. 533. 
Two females, Ashland and West Point, June (L. Bruner). 
These species are both black, but differ greatly in size and color 
of pilosity. 
Subfamily LARRINAE 
KEY TO THE GENERA 
Face along the inner eye margin without a swelling or fold. 
Comb of anterior tarsi of female composed of very long flexible spines 
or bristles; pygidial area naked; hind ocelli oval; fore femora of the 
male always emarginate beneath near the base............ Tachysphex 
Comb of anterior tarsi of female composed of stiff rather short thorns; 
pygidial area entirely covered with pubescence; hind ocelli linear, 
hooked at upper end; fore femora of male either emarginate or sim- 
ple ‘bendath, ‘near the base.c24 csc cas res omsimobicwers ee enone Tachytes 
Face with a more or less developed longitudinal swelling or fold along 
the inner eye margin. 
Pronotum not drawn under the mesonotum; metanotum shorter than, 
the mesonotum; anterior femora of male emarginate near the base; 
pygidial area bare toward base, but with short stiff hairs at apex, 
Ancistromma 
Pronsiiin drawn under the mesonotum, especially at the sides; meta- 
notum longer than the mesonotum; anterior femora of the male not 
emarginate near the base; pygidial area clothed with a silvery pu- 
DESCEMEE) BS) SeKcace asthe de igaks wl elecneisl mone eae ee ere eth te Notogonia 
Genus Notogonia Costa 
Notogonia argentata ( Beauvais). 
1811. Larra argentata Beauvais, Insectes d’Afrique et d’Amerique, p. 
119. 
374 
