377 



these two species. In the males of both the maxillae have a tooth 

 at the apex on the outer side. The vulvae are different: in D. Im- 

 status the vulva has the form of a small, brown, somewhat convex 

 area, which it front, where it is more or less rounded, and at the 

 sides, is bounded by a furrow; it exhibits a depression in the middle 

 of the posterior margin, and another on each side, near the ante- 

 rior margin. In D. rudis the vulva is somewhat larger than in I>. 

 hastatus; it appears to consist of a small, slightly transversal, eleva- 

 ted area or callus, whicb is rounded in front and depressed behind; 

 immediately in front of this area is a little almost semicircular, 

 sometimes very indistinct, depressed area, which appears to be bounded 

 by two costse curving towards each other, and which exhibits a small 

 protuberance on both sides behind: it is divided into two compart- 

 ments by a longitudinal septum connected with the elevated area. 



Simon's description ') of his A. sex-punetatus (= A. ravidus Sim. 2 )) 

 so exactly suits such full-grown females of D. rudis, as have lately 

 changed their skin, and are as yet entirely uninjured, that I should 

 not have hesitated to consider these two species as identical, had 

 not Simon declared that such a female of D. rudis, which 1 sent to 

 him, belonged to his A. medius, and assured me that it was de- 

 cidedly different from A. sex-punctcdus or ravidus. In such uninjured 

 females of D. rudis the olive-yellow back of the abdomen is marked 

 by two greyish white, almost triangular patches near the middle 

 (and frequently two similar patches in the extreme front, united 

 with the middle patches by two longitudinal greyish white lines); 

 these patches are produced in the form of stripes directed obliquely 

 downwards and backwards to the sides of the abdomen, which are 

 usually marked with a longitudinal, irregular light band; at the po- 

 sterior extremity of the back are perceived two dark, parallel, lon- 

 gitudinal lines, and a row of 3 or 4 white spots in each line. 



(Pag. 559.) 10. A. V-iusignitus [= Yllenus v-intiffnitus (Cleeck) 



1757]. 



Syn.: 1757. AKANEUS LITERA V INSliiNlTUS Clerck, Sv. Spindl., p. 121, 



PI. 5, tab. 16. ) , 



1757. „ V INSIGNITUS id., ibid., p. 154. \^v=~0)- 



1) Monogr. d. Attides, p. 579 (113). 



2) Ibid. , p. 571 (105). 



