138 PROCEEDINGS OP THE ACADEMY OF 



of stigma, another beneath apex, and the apical margin dusky, 

 apical margin of posterior pair dusk^', stigma pale yellowish, 

 blackish at tip ; legs slender, uniformally ferruginous, posterior 

 tarsi yellowish, dusky at tips ; abdomen more or less tinged with 

 fuscous. Length 4^ lines. 



Orizaba. Closely allied to ce-stus, Sa}-, but quite distinct. 



10. Cryptus xanthostigma. 



Cri/ptus xaathostigma, Brulle, Ilym. p. 190. 



Mirador. One % specimen. 



Genus JOPPIDIUM, Walsh. 



The species of this genus are slender in form, especially that 

 of the % . the legs slender, the posterior pair unusually long ; the 

 antennae of 9 often thickened before the apex, somewhat as in 

 Jop2')a ; tlie Avings ample and in the Mexican species, so far as 

 known, entirely blackish; the abdomen more slender than in 

 Cryptus, the first segment being long and linear. 



The three Mexican species are closely allied and may be sepa- 

 rated by the characters given in the following table : 



Body black ; all the tibia; and tarsi yellow 1. dubiosum. 



Body ferrngiuous ; metatliorax, hind coxpe, first abdominal segment 9 1 



and whole of abdomen % , black 2. ardens. 



Body entirely ferruginous o. donabilis. 



1. Joppidium dubiosum, n. sp. 



9. Shining-black; head entirelj^ ferruginous, as well as base 

 of antennte, the middle of which is orangc-^-ellow, and tlie apical 

 third black; anterior legs entircl}', most of intermediate femora, 

 four posterior tibi;c and tarsi, bright yellow; wings black, with a 

 strong purple reilection. Form slender ; antenuiu longer than 

 bead and thorax, slightly thickened before apex, the third, fourth, 

 and fifth joints long and subequal ; raesothorax with the dorsal 

 lines well impressed, with a shallow longitudinal impression down 

 the middle and also on each side over tegula?; scutellum triangu- 

 lar, convex at tip and deeply excavated at base ; metathorax 

 transversely striated except at base which is smooth, and the 

 sides which are punctured ; wings ample, areolet rather large, 

 5-angular; legs long and slender, especially posterior pair; abdo- 

 men slender, fusiform beyond first segment, which is long and 



