76 Bulletin of the Brooklyn Entomological Society Vol. XII 



Described from a single male specimen collected by Messers 

 E. A, Schwarz and H. S. Barber at Williams, Ariz., and now in 

 the collection of the U. S. National Museum. 



The specimen described is neither a typical Myiom-ma, Iso- 

 metopus, or Lidopus, but as the form of the pronotum is nearest 

 Myiomma it appears best to place it in this genus until more 

 specimens are procured. 



Genus Isometopus Fieb. — Isometopus Fieber, Exegesen. Wiener Ent. 

 Monatschrift, iv, pp. 258-259, i860. Cephalocoris Stein, Berl. Ent. Zeit., 

 p. 79, i860. 



Somewhat broadly ovate; head broad, rounded in front. Third and 

 fourth joints of antennae slender and short. Pronotum transverse, pos- 

 terior border slightly wider than anterior, lateral borders if produced 

 would meet at a point considerably before front of head, lateral margins 

 flaring. Hemelytra convexly ampliated on each side. 



Type of the genus is intriisus H. S. 



Key to the Species. 



1. Elytra uniformly dark in color unicolor Held. 



Elytra not uniformly dark in color, with a more or less definite color 



pattern 2 



2. Posterior half of pronotum and scutellum light in color; antennae, ros- 



trum, and legs dark lihertus n. sp. 



Entire portion of pronotum and scutellum dark brown or black; an- 

 tennae, rostrum, and legs light fuscous or white 3 



3. Fuscous markings at center and apex of corium signatus Heid. 



No fuscous markings at center or apex of corium. The only color 



markings are at apex of clavus and center of posterior margin of 

 corium pulchellus Heid. 



Isometopus unicolor Heid. — Isometopus unicolor Heidemann, Proc. Ent. 

 Soc. Washington, Vol. 9, p. 130, 1907. 



This species can readily be distinguished from all others by it's uniform 

 color. No distinct color markings. It is also slightly larger than either 

 signatus or pulchellus and about equal to lihertus. Its occurrence has been 

 reported from Arizona. 



Isometopus libertus n. sp. — Form ovate. Head short, broad, vertical. 

 Eyes large, distance between them greater than width of an eye. Ocelli 

 small but distinct. Eyes protruding to the rear of the posterior line of 

 the vertex. Second joint of antennae slightly swollen at apex. Basal 

 width more than twice the length of pronotum. Anterior half of pro- 

 notum slightly depressed but with a transverse ridge in the center, not 

 running to the lateral borders. Posterior border of pronotum straight, 

 lateral margins flaring and if produced would meet at a point considerably 



