•26 Memoirs of the Indian Museum. [Vol. VII, 



the lamellae were very long and slender as in the latter of these species. The clypeus has the 

 form characteristic of the genus. The central tubercle is narrower and less separated from 

 the surface of the head than in 0. ridiculus and 0. sargi. The pronotum is more extensively 

 punctured round the scars than in either of these species. The mesothoracic episterna are 

 polished throughout. The meso- and metasterna are extensively covered with hair-bearing 

 punctures, especially laterally. The grooves of the elytra are quite as strongly punctured 

 -as in 0. ridiculus. 



Genus SPURIUS, Kaup, 187 1, p. 75. 

 Type, Passalus bicornis, Truqui, 1857, p. 317. 



Spurius bicornis (Truqui). 



Passalus bicornis, Truqui, 1857, p. 317. 

 One specimen from Mexico and two from Guatemala. Length i7*5-i8'o mm. 



Spurius dichotomus, Zang. 

 Fig. IV, 4, p. 24. 

 Spurius dichotomus Zang, 1905a, pp. 227-229. 



One specimen from Guatemala, and one unlabelled preparation of the head and 

 appendages. Length 21 mm. 



This species may readily be distinguished from the preceding by its somewhat larger 

 size ; by the smaller size of the conical processes representing the parietal ridges, which are 

 oblique instead of transverse ; and by the shape of the clypeus, which is procurved instead of 

 straight. 



Genus POPILIUS, Kaup, 187 1, p. 75. 



Inch Heliscus, Zang, 1905 (=Soranus, Kaup, 187 1 , preoccupied) ; Odontotaenius, Kuwert, 

 1896 (=Passalus, auct. nee Fabricius, see Zang, 1905c, pp. 224-225) ; Passalotaenius, 



Kuwert, 1896. 



Type, Passalus marginatus, Percheron, 1835, pp. 89-90, pi. vii, fig. 1. 



Popilius recticornis (Burmeister). 

 Fig. IV, 5, p. 24. 

 Passalus recticornis, Burmeister, 1847, pp. 508-509. 



Four specimens from Mexico. Length 18-20 mm. 



P. recticornis is the smallest species of its genus known to me. The antennal lamellae 

 are short. The clypeus is strongly procurved. The frontal ridges are obsolete, but the 

 central tubercle, which is directed forward, is very strongly developed, the apex being free. 

 Apart from some of these characters,, and the smoothness of the metasternum 

 characteristic of the genus, P. recticornis closely resembles the above described species of 

 the genus Oileoides. The mesothoracic episterna are, however, less extensively punctured 

 and uniformly glossy, and the prosternum is truncate behind. The punctures round the 

 scars on the pronotum are usually more numerous even than in 0. subrecticornis. 



