434 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lu 



Hemelytrou: Clavus and corium alutaceous; clavus punctate near 

 base and with single longitudinal row; mesocorium with one complete 

 row of punctures paralleling claval suture and mth punctures crowded 

 on basal third; exocorium with few punctures scattered along length; 

 costa convex, with one setigerous puncture ; membranal suture nearly 

 straight; membrane longer than basal width, reaching apex of abdomen. 



Propleuron: Shining, distinctly punctate only in depression and at 

 base of acetabulum; prosternal carinae about half as high as labial II, 

 abruptly terminated posteriorly. 



Mesopleuron : Lateral area rugose, impunctate. 



Metapleuron: Terminal lobe of peritreme triangular posteriorly, 

 separated from straight lateral margin of evaporatorium by space 

 greater than transverse width of lobe; lateral area impunctate. 



Legs: Anterior tibia with six stout spines dorsally. 



Sternites: Finely alutaceous, with very few punctures behind spirac- 

 ular area. 



Length of body: 4.71. 



Type data.— Holotype female (USNM 64416), from Veracruz, 

 Mexico, "F. H. B., 586." 



Discussion.- — ^See discussion under M. cavicollis (Blatchley). 



Melanaethus mixtiis, new species 



Plate figure 211 



Diagnosis.- — The small size, presence of two types of punctures 

 on posterior lobe of the pronotum, lack of an impression between 

 the calli, and the large terminal lobe on the peritreme will permit 

 separation of this species from others in the genus. 



Description. — Male: Two specimens, one lacking antennae and 

 labium. Oval, robust, sides subparallel or weakly diverging posteri- 

 orly. 



Head: Length almost two-thirds width, 0.47(0.47-0.47) : 0.76(0.76- 

 0.76); interocular width, 0.52(0.51-0.53); anterior outline broad, less 

 than a semicircle, clypeus as long as or very slightly longer than juga; 

 surface, including clypeus, shining, with crowded, distinct punctures; 

 jugum with distinct, marginal carina dorsally, one submarginal seti- 

 gerous puncture; ocelli small, separated from eye by space more than 

 twice transverse ocellar width; jugum ventrally shining, impunctate; 

 maxillary plate distinctly punctate on basal two-thirds. Antennal 

 segments (missing from larger specimen): I, 0.16; II, 0.16; III, 0.16; 

 IV, 0.23; V, 0.27. Bucculae higher than labial II, abruptly termi- 

 nated posteriorly; labium reaching between middle coxae. Labial 

 segments (missing from larger specimen): I, 0.21; II, 0.40; III, 0.27; 

 IV, 0.23. 



