112 OETHOPTEEA. 



one morning in November while the south -bound train on the Mexican Central Railroad 

 was waiting on a siding. The female insect figured on Tab. I. under the name of 

 Aulocara brevipennis belongs to the genus Zapata. 



LIGUKOTETTIX, McNeill. 

 Ligurotettix, McNeill, Proc. Dav. Acad. Nat. Sci. vi. pp. 257, 258 (1897). 



This genus, which possesses characteristics of the CEdipodinae and Acridiinae, as well 

 as of the Tryxalinse, is not at all closely related to any of the preceding genera, but it 

 seems to represent a distinct section of the subfamily. In its distribution, Ligurotettix 

 is confined to the region bordering the international boundary-line between Mexico and 

 the United States, where its two representatives are known to live among and upon 

 scattered desert vegetation indigenous to the district. The insects are dull, almost 

 uniform greyish-brown in colour, while the males are equipped with the most complete 

 stridulating-apparatus to be found in the family. According to Mr. D. W. Coquillett, 

 the music of L. coquelletti is as loud and sustained as that of some of the Cicadidse. 

 The two recognized forms may be separated thus : — 



Table for separating the Species of Ligurotettix. 



A 1 . Larger (length, £ 17, ? 24 millim.), more slender 2. kunzei, Caudell. 



A 2 . Smaller (length, <$ 14-16, ? 18 millim.), more robust 1. coquilletti. McNeill. 



1. Ligurotettix coquilletti, McNeill. 



Ligurotettix coquilletti, McNeill, Proc. Dav. Acad. Nat. Set. vi. p. 258, t. 5. figg. 24, 24 a-c (1897) \ 

 Hob. Noeth America \ Los Angeles County, California (Coquillett), Needles, Cali- 

 fornia (WicMam), Yuma, Arizona (Leon La Forge). 



The specimens from these localities are all in the collection of the present writer. 



2. Ligurotettix kunzei, Caudell. 



Ligurotettix kunzei, Caudell, Proc. Ent. Soc. Wash. v. p. 162 (1903) \ 



Hob. North America \ Phoenix, Arizona (Kunze), Florence, Pinal County, Arizona 

 (Biederman). 



GONIATRON, gen. nov.* 

 The characters given in the footnote, together with those mentioned in the specific 



* This genus seems to be most closely related to Ligurotettix, amongst the Mexican forms. The structure 

 is peculiarly composite, showing some of the characteristics of all three subfamilies, the (Edopidinje, Acridiinse, 

 and Tryxalinae, but with the prevailing features approaching those of the latter. On account of the 

 decidedly spined presternum and the selliform pronotum, it was first thought by the writer to be an aberrant 

 form belonging to the Acridiinae. However, after a more careful study and some deliberation, it has been 

 thought best to place it in the present position. This explanation will indicate why Goniatron was not 



