MONOBIA. 135 



Body black with gray-silky reflections. Two spots on meta- 

 thorax prolonged as lines on the inferior ridges, pale orange-yel- 

 low, or yellow. Wings black, with violaceous reflections. (Mexico.) 



Var. a. Tarsi and anterior tibias rather ferruginous. The first 

 abdominal segment adorned on each side with a yellowish margin. 

 (Brazil.) 



b. Mandibles and extremity of clypeus brown ferruginous. 



c. Metathorax black ; only its inferior ridges yellow. (Surinam.) 



d. The metathoracic cavity more or less punctured. 



%. Smaller. Clypeus black, punctured, rather short; its infe- 

 rior border broadly truncate, or a little concave with its angles 

 rather projecting. Antenna? slender, armed with a terminal 

 hook; beneath ferruginous; the scape with a yellow line. Often 

 a yellow spot between the antennae. Anterior margin of pro- 

 thorax rather concave. The angles of the metathorax blunt. 

 Wing scales brownish. Tarsi sulphur-yellow, with a brown line 

 on their superior face. (Brazil.) 



Bess. a. diff. — This is sufficiently distinguished from M. bian- 

 gulata by its more rugose clypeus and the punctuation of its 

 abdomen, for in this the border of segments 2d and 3d is 

 shining, testaceous ; and the segments 3d-5th are not more 

 punctate than the 1st and 2d. 



Hab. Mexico (Orizaba) and South America. 



1. M. Mangtilata n. sp. (Fig. 12, 12«.)— Valida, nigra, punctata; M. 

 angulosce affinissiuia ; metanoto valde exc-avato, foveola nitida tenuiter 

 punctata instructo et utrinque angulato ; macula frontali et subalari, 

 puncto post-oculari, maculis 2 metanoti fasciaque intemipta in pronoto 

 et abdominis segmentorum margine 1, 2, fulvis ; alis fusco-cyaueis. 



Total length, 19 mm. ; wing, 16 mm. 



9. Large. Head and thorax cribrose with punctures; meta- 

 thorax velvety, offering a circular concavity, deep, smooth, and 

 finely punctured, but which is not bordered at the summit except 

 by some depressed ridges ; on each side a sharp dentiform angle 

 is placed without the concavity. Abdomen smooth, sericeous, 

 ovalo-conical ; the first segment a little narrower than the second, 

 rounded ; the 2d and 3d segments both offering along their border 

 a line which forms a separation like a second border. 



Insect black, clothed with a fine gray pile. Scape of the 

 antennae more or less ferruginous beneath. A spot on the face, 



