NORTH AMERICAN COLEOPTERA. 17 



3. Antennse eleven-jointed, the club % elongate with 4-7 lamellae. 



4. Pleoconia should form a distinct group, related more closely to 

 the Geotrupini than any other group of Laparosticti. 



5. Any relationship with the Melolonthidae must be deduced (1) 

 from the elongate antennal club (2), the geminate, oblique stride of 

 the elytra which represent the feeble costte of the Rhizotrogini (S), 

 the long hair of the underside. The first alone has substantial value. 



6. It seems to me of but little moment whether Pleocomiui is 

 placed before, after, or alongside of Geotrupini, the fact remains 

 that, inasmuch as Pleoconia is a Laparostict, Geotrupini is its nearest 

 ally. It has nothing to do with the Dynastini. 



7. The larva described by Osten-Sacken is undoubtedly that of 

 Pleocoma. Mr. James Behrens, who obtained the larva, has given 

 me sufficient evidence apart from the structure. As these data will 

 probably be published by Mr. Behrens, I merely state the fact and 

 leave the other evidence to him. 



DESCRIPTION OF PLATES. 



PLATE I. 



This plate has been produced by Mr. F. Gutekunst by means of the Phototype 



process from photographic negatives taken directly from the specimens. The 



figures are. therefore, accurate reproductions of the form and appearance of the 



species. 



Fig. 1. Pleocoma fimbrinta'" Ijec. The original type. The artist seemed pleased 

 to find that many of the defects had been concealed by the arrange- 

 ment of the light. The figure looks far better than the specimen. 



Fig. 2. the same, a perfect specimen. 



Fig. 3. P. conjungens Horn. 



Fig. 4. P. Behrensii Lee. 



Fig. 5. P. Behrensii'' Lee, a female. 



Fig. 6. P. Ulkei Horn. 



Fig. 7. P. Ricksecheri Horn. 



Fig. 8. P. Rickseckeri Horn, a female. 



Fig. 9. P. «tif» Schaufuss. 



Fig. 10. P. hirticollis Schaufuss. 



Fig. 11. P. hirticollis''' Schauf., a female. 



Fig. 12. P. hirticollis Schauf., a larger female. 



* 1 am indebted to the kindness of the authorities of the Museum of Compara- 

 tive Zoology at Cambridge, through Dr. Hageu, for the facilities extended iu the 

 preparation of the necessary negatives for the specimens indicated. 



TRANS. AMEE. ENT. SOC. XV. (3j FEBRUARY, 1888. 



