MORGAN HEBARD 91 



BB. Pronotum with caudal margin weakly concave. Tegmina and 

 wings vestigial, linear, lateral; the former with apices sharply rounded, 

 nearly acute. Dorsal genicular angles of caudal femora much more strongly 

 produced than the ventral. 



C. Head shorter, vertex less produced and face less concave. An- 

 tennae shorter. Pronotum with lateral lobes deeper. Male subgenital 

 plate shorter and heavier. Caudal femora shorter and heavier. South- 

 eastern states, in Florida south to central peninsular portion. 



Radinotatum brevipenne brevipenne (Thomas) 



Genotype of Radinotatum 



CC. Head longer, with vertex much more produced and face more 



concave. Antennae longer. Pronotum with lateral lobes shallower. 



Male subgenital plate longer and more slender. Caudal femora longer 



and more slender. Southern peninsular Florida. 



Radinotatum brevipenne peninsulare R. & H. 

 Tuberculation of the prosternum and number of caudal tibial 

 spines are of hardlj' any value as generic criteria in this group. 

 The prosternum does not bear a small tubercle, as has l)een 

 stated in past literature. The numl)er of spines on the dorso- 

 external margin of the caudal tibiae is individually variable and 

 unsafe as a generic character. The extremes and average for 

 the species before us show the difference between Achurum and 

 Radinotatum to be much less in this respect than has been sup- 

 po.sed. 



Achurum sumichrasti (Saussure) (Plate IV, figures 1, 2, 3 and 4.) 



1861. Tr[uxalis {Achurum)] sumichrasti Saussure, Rev. et Mag. de Zool., 



xm, p. 313. [ 9 , Temperate Mexico.] 

 1873. T[ruxalis] acridodes StB, Ofv. K. Vetensk.-Akad. Forh., 1873, no. 4, 



p. 52. [cf, Mexico.] 

 1897. Achurum sumichrasti McNeill, Proc. Davenport Acad. Nat. Sci., vi, 



p. 202, pi. I, figs. 2, 2a, 2b, 2c. [Fort Grant, Arizona.^] 

 1904. Rhadinotatum brevipenne Bruner (not Tryxalis brevipenne Thomas, 



1873), Biol. Cent.-Amer., Orth., ii, p. 34. [" cT", juv.; Orizaba, [Vera 



Cruz], Mexico.^] 



' This is the first record of the species from the United States. Scudder 

 (Index, N. A. Orth., p. 5, (1901)) is in error in crediting to Thomas a record 

 of A. acridodes from the western United States. Thomas stated, "The 

 following new species is described from Mexico by StS.1," after having re- 

 marked on page 851 that no adult Truxalids were in the collection there 

 reported. (Rept. Geol. Geogr. Expl. Surv. \\'est of 100th Merid., Wheeler, 

 v, p. 805, (1875).) 



^ The specimens upon which this record, from memory, was based are in 

 the Hebard Collection ex Bruner. The reason that author was unable to 

 find them when preparing the manuscript for the Biologia appears to be that, 

 in the interim, he had recognized them as immature examples of Achurum 

 sumichrasti and had so labelled them, afterwards forgetting that assignment. 



TRANS. AM. ENT. SOC, XLVHI. 



