REHN AND HEBARD 81 



the genus, of the features here given as diagnostic of this form. 



The species is, however, from a locality at which unispina also 



occurs. 



Specimens Examined: 1 d'. 



Guadalajara, Jalisco, Mexico, (D. L. Cra^v'ford), 1 cf , type, [A. X. S. P.]. 



Orchelimum unispina (Saussure and Pictet) (Figs. 17, 34, 67 and 68.) 

 1898. Xiphidium unispina Saussure and Pictet, Biol. Cent.-Amer., Orth., i, 



p. 398. [Jalisco and Orizaba, Mexico.] 



This species was originally described as a species of Xiphidium 

 ( = Conocephalus as at present restricted), but it is clearly a mem- 

 ber of the genus Orchelimum, although belonging to a subgenus 

 which approaches Conocephalus. Saussure and Pictet described 

 only the male sex, but by a lapsus calami they give the sex of the 

 measured material as female. 



It is evident that this species shows considerable variability 

 in tegminal and wing length, the original material having had 

 the tegmina surpassing the caudal femora and the wings surpass- 

 ing the tegmina, while the only adult seen by us has the tegmina 

 decidedly failing to reach the tips of the caudal femora and the 

 wings subequal to the tegmina distad. 



Measurements {in millimeters) 



We have before us a male in the second instar preceding ma- 

 turity, and this shows that the cerci do not develop their character- 

 istic structure until the last or next to the last ecdysis. 



This species is known only from central and south central 

 Mexico, the records being from Orizaba, state of Vera Cruz, and 

 the state of JaUsco, and specifically Guadalajara and Ocotlan in 

 the latter state. 



Specimens Examined: 2; 1 o^, 1 juv. cf. 



Guadalajara, Jal'sco, Mexico, (D. L. Crawiord), 1 d^, [A. N. S. P.]. 



Ocotlan, Jalisco, Mexico, 5000 feet elevation, VIII, 29 to IX, 1, 1906, (P. P. 

 Calvert), 1 juv. d, [A. N. S. P.]. 



TRANS. AM. ENT. SOC, XLI. 



