BRAZILIAN MUTILLA. 61 



metathorax as in escada; tegiilse fuscous, the pubescence pale. Wings suhhaline, 

 darker at apex, neuration as in mavapa. Legs with the pubescence and calcaria 

 pale. Abdomen formed much as in mncapa, the punctures scattered and espe- 

 cially sjtarse on second segment which is polished ; the pubescence on segments 1 

 and 2 scattered and white, that on apex of second and the thi-ee following seg- 

 ments golden, more obvious when viewed laterally; the two apical segments 

 black, with black pubescence; venter with sparse pale pubescence. 



Chapada (April). Two specimens. This is smaller and more 

 slender than the other species of this group, and with the clypeal 

 tooth narrower and more acute. 



4. M. rufiventrijii Klug (Nova Acta.Cses. Nat. Cur., x, p. 306. pi. xxi, fig. 12). 

 % .—Length 11-12 mm. — Very much like macapa, but easily distinguished by the 

 basal process of the clypeus being transverse, broadly rounded and roof-like, and 

 by the pubescence on apical margin of the second and following segments of 

 abdomen being golden; the reticulations of metathorax are larger and the basal 

 area more or less irregularly shaped, and the tegulee have pale pubescence; the 

 terminal segment of the abdomen is sometimes more or less black or fuscous. 



Corumba, Santarem ; lowlands (March). 



The following twelve species have the abdomen subpetiolate, the 

 first segment narrow, depressed, usually quadrate, or elongate (c«- 

 tinga, dbadia), sides generally parallel, occasionally subnodose (.sm- 

 cora, pinha), rarely transverse at apex {vieosa) ; second segment 

 soutetimes much flattened above at base (argentnla) ; segments 4-7 

 tvith a central longitudinal carina in all the species ; clypeus longi 

 tudinally carinated at base, the carinse sometimes ending in two 

 teeth towards apex ; eyes ovate, deeply emarginate, facetted ; pi"0- 

 thorax rectangular in front, anterior angles more or less prominent 

 and acute; mesothorax generally roughly sculptured and longitu- 

 dinally costate ; scutellum generally convex, sometimes flattened, 

 shield-like and toothed at apex (catinga) ; the metathorax always 

 densely pubescent, depressed, with more or less angulate or toothed 

 sides and often with a distinct subapical discal tooth ; tegulse unusu- 

 ally large and elongate-ovate, rarely with a longitudinal carina 

 {gracilis, laguna), or tuberculate at base {catinga) ; wings with large, 

 lanceolate or sublanceolate marginal cell ; generally small, narrow, 

 oblique first marginal cell ; large, elongate second subniarginal cell, 

 and very large, irregularly shaped third submarginal, the outer 

 nervure of which is generally more or less indistinct, and extending 

 far beyond the apex of marginal cell. 



TKANS. AM. KNT. SOC. XXVIII. JANUARY, 1902. 



