REHN AND HEBARD 45 



propose Pediodectes'-' with Pediodectes grandis (Rehn) [Stipator 

 grandis Rehn] as its type. Saussure's americanus is really the 

 species for which Scudcler used Burmeister's name dorsalis. 

 The name Engoniaspis Brunner, 1893, and Scudder, 1894, 

 having no described species cannot be considered, the 1900 

 description of Scudder being the first of complete form, from 

 which consequently testaceus, the first included species, must be 

 taken as the type. As we have shown under testaceus, that name 

 should apply to the species for which Scudder used the Burmeis- 

 terian n&mepachymerus, testaceus having been based on a damaged 

 female, which, however, Scudder considered of uncertain sex. 

 Walker's derogatus we now know to have been based on the 

 species called dorsalis by Scudder, not of Burmeister, and amer- 

 icanus by Saussure. Caudell, in 1907, had pachijmerus, testa- 

 ceus and davisi confused as a single species, the evident differ- 

 ences being ascribed by him to individual variation. The same 

 author referred to the present genus immature specimens belong- 

 ing to other genera from Arizona and California. 



Material Examined. — We here record 419 specimens of the 

 genus, these comprising practically all the series in the collec- 

 tions of the Academy of Natural Sciences of Philadelphia, of 

 the junior author, the United States National Museum, the 

 Museum of Comparative Zoology, of Prof. A. P. Morse of Wel- 

 lesley, Massachusetts, of Mr. W. T. Davis of New Brighton, 

 New York, the Pennsylvania State Department of Zoology, the 

 Georgia State Collection, the North Carolina Department of 

 Agriculture and Cornell University. Certain specimens belong- 

 ing to the American Museum of Natural History have also been 

 examined. To the gentlemen above named and the authorities 

 in charge of the collections of the above mentioned institutions 

 and departments we wish to tender our thanks for the assistance 

 so ungrudgingly given to our work. Of the total number of 

 specimens examined 211 were collected by the authors, these 

 representing all but one of the forms. 



The types of the following have been examined by us: 



Engoniaspis testaceus Scudder 



Atlanticus davisi new species 



Atlanticus monticola Davis 



i^From ireUov -plain (in allusion to its hal)itat) and 577^x779 a hiter. 



TRANS. AM. ENT. SOC, XLII. 



