54 
Psyche 
[June 
ferences, coupled with the absence of tibial spurs and a 
very distinctive body form, set off our species of Tomoderus 
so strikingly that it is questionable whether they should 
be included in the Anthicidae. 
There is little reason to expand the description of the 
genus given by Casey (1895, Ann. N.Y. Acad. Sci. 8:648). 
The following key to species is based entirely on the male 
genitalia, since they provide the only completely reliable 
features for distinguishing species. 
1. Genitalia notched near the apex 2 
Genitalia not notched near the apex 3 
2. Genitalia very unequally notched near the apex, formed 
into a hook T. interruptus Laf. 
Genitalia almost equally, and only feebly, notched near 
the apex T. constrictus (Say) 
3. Genitalia slender, slightly expanded just before apex. 
T . inhabilis sp. n. 
Genitalia thick, tapered and slightly constricted just 
before apex T. impressulus Say. 
Tomoderus interruptus La Ferte 
Plate 5, Figs. 2, 6 
Tomoderus interruptus La Ferte, 1848, Monographie des Anthicus et 
genres voisins . . . : 97. LeConte, 1852, Proc. Acad. Nat. Sci. Phila. 6: 94. 
Casey, 1895, Ann. N.Y. Acad. Sci. 8: 648. 
Tomoderus interruptus var. y ( bilobus Dejean) La Ferte, 1848, op. cit . : 98. 
Tomoderus abbreviatus Casey, 1895, loc. cit. ( lapsus calami in the key 
to species). 
As here interpreted this is the commonest species in 
Florida, ranging from there west to coastal Texas and 
Explanation op Plate 5 
Male genitalia of Tomoderus, Figs. 1-4 in dorsal view as they lie 
in the abdomen, Figs. 5-8 the same specimens in lateral view; all figures 
with the posterior end at the top. Fig. 1 . T. constrictus (Say), Falls 
Church, Virginia. Fig. 2. T. interruptus Laf., Harahan, Louisiana. Fig. 
3. T. inhabilis sp. n., Iowa City, Iowa. Fig. 4. T. impressulus Csy., Valley 
of the Black Mts., N. Carolina. Fig. 5. T. constrictus. Fig. 6. T. inter- 
ruptus. Fig. 7. T. inhabilis. Fig. 8. T. impressulus. 
