REHX AND HEBARD i6 



1894. [Allanticus] dorsalis Scudder (not Decticus florsalis Biinnoistor, 1838), 

 Canad. Entom., xxvi, pp. 179, 180, 183. (In kej' to species of genus.) 



1900. Siipator americanus Rehn, Trans. Amer. Entom. Soc, xxvii, p. 90. 

 (Bare combination.) 



1907. Ailanlicus dorsalis Caudell, Proc. U. S. Xat. Mas., xxxii, p. 321, fig. 

 26. (Part.) [Maryland; Virginia; District of Columbia; Mississippi.] 



(AtUmticus dorsalis of authors.) 



The nomenclatorial tangles of the present species have been 

 due almost entirely to two unfortunate misidentifications by 

 Scudder. The first was the determination of the present species 

 as Burmeister's dorsalis, which, Uke the similar one oipachymerus, 

 was pardonable on account of the lack of material of true dorsalis. 

 We now know, however, that the present species does not occur 

 in the region from which the typical material of dorsalis prob- 

 ably came (i. e. the coastal region of South Carolina). The other 

 error was the identification of Saussure's Orchesticus americanus 

 as a member of a related genus, which is not known from east of 

 the trans-Mississippean prairie and plain region, for which the 

 name Orchesticus and later Stipator have been used. For com- 

 ments on these generic names see remarks made under the gen- 

 eric treatment. The original generic and specific descriptions 

 of americanus are sufficiently full to bring out the following fea- 

 tures possessed by Saussure's species: pronotum subcarinate, 

 margins of the median area sinuate; caudal femora beneath finely 

 spined; ovipositor straight, very long (30 mm.); coloration fus- 

 cous, hneate with yellow on both sides in pronotal sinus. Of 

 these features none apply to the forms of the genus for which 

 Scudder and other authors have used the ntime, while all are 

 descriptive of the Atlanticus found in Tennessee, the type locality. 



Walker's derogatus is identical with the present species; Kirby-® 

 so considered it and Mr. Caudell has kindly suppHed us with 

 notes and measurements made by him from the type which fully 

 corroborate Kirby's assignment. 



This species is easily recognized when compared with the other 

 forms of the genus, the characters given in the key being sufficient 

 to distinguish it. The male will under no circumstance cause the 

 least hesitation in recognition, on account of cereal and tegminal 

 characters, and the female can invariably be recognized by the 

 deep di\nsion of the subgenital plate, the lateral portions of which 



26Syn. Catal. Orth., ii, p. 181, (190G). 



TEANS. AM. ENT. SOC, XLII. 



