1U12| New Neotropical Tipidince 345 



tergitc distinct, about as wnde as the 7th, its caudal margin straight, its 

 lateral comers evenly rounded; 7th stemitc rather broad, broader then 

 the sixth stemitc; Sth stemitc very large, longer than the three pre- 

 ceding segments combined and projecting caudad beyond the remaining 

 appendages; its ventral face is evenly rounded, broad at the base, 

 narrowing apically, at its tip turned abraptly dorsad and ending in two 

 blunt teeth, these teeth bifid with the caudal denticulum rather the 

 longer. Above the origin of the Sth sternite arises the 9th stemite: 

 broad basally, rapidly narrowed toward the ti]0 into a chitinous, spoon- 

 like appendage, convex on its outer face, concave on its inner. 9th 

 tergite with the caudal margin rather deeply incised medially, the 

 adjacent lobes brown, chitinized, and bent ventrad at the tip. Tw-o 

 distinct sets of apical appendages arising from the genital chamber, 

 which may, or may not, be connected with one another nearer their 

 bases; first, a pair of dorsal-lieing appendages which are bifid with the 

 ventral tooth greatly prolonged, stylet-like (see Fig. ki). Beneath 

 these are two large complex appendages (see Fig. k) which may be 

 described as being three-branched, the ventral branch is strongly 

 chitinized and expanded, six-toothed, of which the most dorsad is the 

 largest; the dorso proximal branch (a) is flattened, its margin chitinized 

 and somewhat reflexed, bearing a spine near its outer edge at the tip; 

 the dorso-distal branch (b) is slender, more fleshy and bears scattered 

 hairs at its apex. Between the ventral organs, just ventrad of the 

 dorsal pair is a large, pale fleshy organ. 



9 Antennae mostly yellowish excepting the apical'segments which 

 are browTi. On the cephalic margin of the mesonotal praescuttmi is a 

 dark browm spot on either side of the usual broad median stripe which is 

 here not indicated ; a large browai spot on the sides of the sclerite about 

 at the anterior end of the usual lateral stripe. Ovipositior (see Fig. r) 

 with the valves very short, blunt, evenly rounded on their lateral 

 margin. 



A paratype male shows the fore portion of a lateral stripe on the 

 prasscutum. 



Holotype, cf, Antigua, Guatemala. Sept., 1902 (Dr. G. Eisen). 



Allotype, 9 , with the type. 



Paratype, <?, Aguna, Guatemala. (Dr. G. Eisen). (Received at 

 U. S. National Museum, Jan. 6, 1903). 



Types in U. S. Nat. Mus. Coll. (No. 15,072). 



Paratype in author's collection. 



Pachyrhina macroslerna, and the following species, trinidad- 

 ensis, are closest allied to circumscripta Lw, ferruginea Fabr. 

 and elegant ula Will., in the respect that the thoracic stripes are 

 not jet-black. The other nine Neotropical species are all 

 black-striped species. These two species form a distinct group, 

 {niacrosterna group), diflfering from the species named above in 

 their petiolate cell M, and powerful hypopygium. The petiolate 

 cell jM, suggests collaris Say of the Northeastern United States, 

 a very different insect. 



