;28 Memoirs of the Indian Museum. [Vol. VII, 



nnpunctured scutellum (the punctures being confined to a pair of longitudinal lines), normal 

 mesothoracic episterna with matt and indistinctly punctured posterior angles, smoother 

 abdominal sterna, and more finely punctured elytral grooves. 



Popilius tropicus (Percheron). 

 Fig. IV, 10, p. 24. 

 Passalus tropicus, Percheron, 1835, pp. 97-99, pi. vii, fig. 4. 



Five specimens from Mexico, and one without locality record. Length 25( S )-28( ? ) mm. 



Kaup recognizes three varieties of this species, based on the sculpture of the upper 

 .surface of the head, and quotes Truqui to the effect that the central tubercle is very variable. 

 One of the specimens before me has a much more strongly developed central tubercle than 

 the others. It is a female and all the others are males 1 . 



The clypeus appears always to be distinctly recurved, and I doubt whether the frontal 

 ridges, which are often absent, are ever very strongly developed. They are straighter than 

 in P. guatemalae. The parietal ridges are not grooved, and the scutellum may be irregularly 

 punctured. In other respects this species resembles P. guatemalae- 



Popilius brevioripennis (Kuwert). 

 Fig. IV, 11, p. 24. 

 Odontotcenms brevioripennis, Kuwert, 1897, p. 290. 



One specimen from Mexico, distinctly smaller than the type (23 instead of 26 mm. 

 long) and with numerous punctures above the scars. The number of these punctures is, 

 however, very variable in the closely allied species, P. striatopunctatus, and the difference in 

 size is within the usual limits of variability. The specimen of P. brevioripennis differs from 

 the single female specimen of P. tropicus before me in having longer antennal lamellae, 

 a strong median convexity of the anterior margin of the clypeus, a slightly trunctate 

 posterior prosternai plate, mesothoracic episterna like those of P. intergeneus, and more 

 strongly punctured elytral grooves. 



Popilius striato-punctatus (Percheron). 

 Passalus striato-punctatus, Percheron, 1835, pp. 101-102, pi. vii, fig. 7. 



Numerous specimens from Mexico, one from British Honduras and two from Nicaragua. 

 Length 25-28 mm. 



The size of the central tubercle is variable ; it is smaller in males than in females, but 

 the difference is not a sharp one. P. striatopunctatus differs from T. brevioripennis in 

 its larger size, its more strongly developed central tubercle and slightly less indistinct 

 frontal ridges. The posterior end of the prosternum is variable. 



Popilius cornutus (Fabricius). 



Passalus cornutus, Fabricius, 1801, p. 256. 



Numerous specimens from Florida, two from Mexico and One from each of the following 

 ^places : — New York, Illinois, Delaware (Wilmington), Ohio and Haiti. Length 29-37 mm - 



1 In one the genitalia were found to be damaged, and I was unable to determine the sex with certainty. 



