NATURAL SCIENCES OF PHILADELPHIA. 131 



banded with black, and in one specimen entirely fuliginous. All 

 have the head broad, with swollen cheeks ; the antennte rather 

 short, slender, that of the male more or less dilated near apex. 

 The following table will aid in distinguishing the species : 



Mesotliorax vittate with black ; wings with apex and submcdian spot l)lack. 



1. Sumichrastii. 

 Mesotliorax, scutellnm, base of metathorax above and tip of abdomen, 



black ; base and apex of wings black 2. decorata. 



Mesotliorax above, aud tip of abdomen blark ; base and apex of Avings black. 



3. incerta. 

 Mesotliorax fulvous ; tip of abdomen and apex of wings black. 



4. elegantula. 

 Mesotliorax fulvous ; head aud tip of abdomen black ; wings fuliginous. 



5. fumipennis. 



1. Joppa Sumichrastii. 



Joppa Sumichrastii, Cress., Trans. Am. Ent. Sec, ii. p. 31, %^ . 



Orizaba; Cordova. (Sumichrast, Nos. 14 and 20.) Common. 



2. Joppa decorata. 



Joppa decorata. Cress., Trans. Am. Ent. Soc, ii. p. 32, %. 



Orizaba. 



3. Joppa incerta, n. sp. 



9 Differs from (Zflcora/a % by the scutellnm and metathorax 

 being entirely yellow ; the posterior tibias are broadly black atf 

 apex, and most of the basal joint of their tarsi yellow. Length 5 

 lines. 



Orizaba. Tliis may be the 9 of decorata. 



4. Joppa elegantula. 



Joppa elegantula. Cress., Trans. Am. Ent. Soc, ii. p. 82, %^ . 



Orizaba; Cordova. (Sumichrast, Nos. 15.) In color and mark- 

 ings the 9 resembles the % . 



5. Joppa fumipennis. 



Joppa fumipennis, Cress., Trans. Am. Ent. Soc, ii. p. 32, ^ J. 



Orizaba; Cordova. (Sumichrast, No. 13.) 



Genus TROGUS, Grav. 



Wings violaceous-black, very broad ; body steel blue ; head, anterior half 

 of thorax, and anterior legs, yellowish-red 1. latipennis. 



Wings hyaline, with two violaceous-black bands ; body and legs black ; 

 posterior tarsi white 2. blandita. 



Wings hyaline, apex only violaceous-black ; body black, marked with yel- 

 lowish-white 3. inclyta. 



