I 



54 PROCEEDINGS OF THE NATIONAL MUSEUM vol.75 



its posterior surface somewhat concave ; middle coxa of male bears a 

 more or less well-developed posterior tooth; middle femur of male 

 near its distal end below bears a pair of flattened, rounded teeth aris- 

 ing from a common base; posterior part of second sternite of male 

 swollen and bearing a pair of rounded elevations; eighth sternite of 

 male ends in a single spine; seventh tergite of male bears lateral 

 spines; spatha of male genitalia as in Figure 73. 



Species belonging to this genus have been reported from Mexico, 

 North America, and from Brazil to Argentina in South America. 



KEY TO THE SPECIES OF RUBBICA 



1. Males (abdomen with 7 visible segments; antenna with 13 segments) 2. 



Females (abdomen with 6 visible segments; antenna with 12 segments) 4. 



2. Anterior metatarsus bearing on its posterior border a series of rounded 



lobelike projections more or less black in color gravida. 



Anterior metatarsus not so fonned 3. 



3. Sixth segment of the flagellum strongly excavated on its posterior side. 



denticornis. 

 Sixth segment of flagellum not strongly excavated on its posterior side. 



surinamensis. 



4. Sixth tergite without a well-defined carina ; outline of tergite as in Fig. 



ure 223 gravida. 



Sixth tergite with well-defined carina ; outline of sixth tergite otherwise 5. 



5. Line dividing upper area of clypeus from lower area a sharply-defined, angu- 



lar ridge surinamensis. 



Line dividing upper from lower area of clypeus not sharply defined, 

 rounded denticornis. 



RUBRICA GRAVIDA (Handlirsch) 



Figures 21, 22, 223 



Monedula gravida Handlirsch, Sitz. Akad. Wissensch. Wien, Math. -Nat. CI., 

 vol. 99, 1890, p. 121.— Dalla Tobre, Cat. Hym., vol. 8, 1897, p. 497. 



Of the known species of this genus gravida is the largest and most 

 robust. The wings are uniformly and rather heavily inf umated. The 

 male of the species has) the anterior metatarsus dilated and flattened 

 with its posterior border bearing a series of roimded lobes usually 

 black in color. The last two segments of the flagellum of the male 

 (eleventh and twelfth) are strongly excavated below and the apex of 

 the tenth below is drawn out into a stout tooth. The female lacks a 

 median carina on the sixth tergite. 



SPECI.MENS EXA.MIXED 



Argentina: Buenos Aires (December 31, 1921). 

 Parv\guay: Sapucay (March 29, 1903, W. T. Foster). 



Handlirsch reports this species also from Rio Grande do Sul, Brazil. 



