92 Orthonhapha brachycera. 



border between the large and small facets, and below this border, in 

 Ihe part wilh the small facets, there are Ihree spots lying near to 

 eacli other corresponding to the three lower spots in the feniale: in 

 the upper part vvitli the large facets, there are only two faint more 

 or iess longish spots. Some small individual variations may occur. 

 In rufipes (Fig. 32) the arrangement is different; \ve find the same 

 band along the the hind-margin, and in front there are also three spots, 

 but in the middle there is a long, triangular spot wilh the apex down- 

 wards, and from the base of the triangle an elongation stretches up- 

 ward; as a rule the middle front spot is in connection with the triangle. 

 Then in the male \ve find the same arrangement, only the upper front 

 spot is as a rule connected with the middle front spot. That in 

 rufipes the arrangement is the same or nearly the same in both sexes 

 evidently is due to the faet that in this species the male has the eye- 

 facets of nearly equal size and without a sharp dividing line; as rufipes 

 also showed another shape of the mandibles, this species thus seems 

 to stand a little separate. It is interesting to see that the arrangement 

 of the eye-sputs found in rufipes is nearly the same as described and 

 figured by Osten Sacken (Mem. of Boston Soc. of Nat. Hist. II, 4, 369) 

 for most of the American species, and he also remarks that the 

 arrangement is nearly the same in both sexes, only that in the male 

 the lower part of the pattern is a little shortened and the upper part 

 lengthened, a difference also seen in rufipes. Thus rufipes would seem 

 related to the majority of the American species. 



J'able of Species. 



1. The middle baml ol the wing with a little deiilation pro- 

 duced to the base of the fork of the cubital vein, the outer 

 margin of the band below the cubital vein concave; legs 



all black "i. sepulcralis. 



— The middlu band of Ihe wing nol leacliing the fork of 

 the cubital vein, the outer margin below the cubital vein 

 convex 2. 



2. Basal joint of antennæ thickened; lemora more or Iess 



yellow 1 . rufipes. 



— Basal joint of antennæ not thickened; femora black 3. 



3. Middle tibiæ yellowish 4. 



— Middle tibiæ brown lo black 5. coecuUens. 



4. Second abdominal segment with a more or Iess quadiatic 

 black spot nol excised behind (c?) or with a little roundish 



or subquadratic spot ($) 3. qnadratm 



— Second abdominal segment with a black spot, deeply excised 

 in the hind margin ((^) or with two oblique spots connected 



in front ($) 4. reUctus. 



