32 Journal New York Entomological Society. t VoL xxvu. 



Fig. 14. Posterior view of the head showing main tracheae entering the 

 occipital foramen from thorax, also the tracheal system of labium and maxillae. 



Fig. 15. Tracheae found in the metathoracic leg. 



Fig. 16. Dorsal aspect of the digestive canal showing on left side the 

 alimentary tracheae and on the right side the abdominal air sacs. 



NEW SPECIES OF SERICA (SCARAB^ID.flE).— I. 



By R. W. Dawson, 



Lincoln, Nebraska. 



Two years ago, while determining the Scarabseidas contained in 

 the collection of the Department of Entomology, University of Ne- 

 braska, the writer became interested in the genus Serica. It was at 

 once apparent that the material at hand could not be named from the 

 existing literature relating to this genus. In some cases the species 

 were obviously new, in others several species seemed to answer equally 

 well to the very brief and general descriptions, and it was impossible 

 to tell which were new and which were not. Further than this, the 

 writer was unable by external characters alone to satisfactorily divide 

 the series before him into definitely marked species, regardless of 

 names. However, some very surprising and encouraging discoveries 

 were made by examining the genitalia of several species. As a result 

 of these studies the task of working out a monographic revision of 

 the genus was undertaken. Up to the present time between two and 

 three thousand specimens, coming from many parts of the United 

 States and Canada, have been studied. 



Special acknowledgment should be made to Messrs. Leng, Blatch- 

 ley, Casey and Skinner for permitting me to examine and dissect 

 valuable type material, and to Mr. Gilbert Arrow for comparing 

 specimens for me with the American types in the British Museum. 

 In fact it is only through this generous assistance that any real prog- 

 ress has been made in applying the published names. 



The large amount of time necessary for making the almost count- 

 less dissections and numerous drawings required for this work, com- 

 pels the writer to return much borrowed material, and publish the 

 descriptions of a number of new species before the study can be 



