4l6 N. E. MCINDOO. 



one on the media. The largest one is similar to No. 4 of Epi- 

 lachna and it may or may not extend all the way to the fold of 

 the wing. When the third group lies on the media, as in Ortho- 

 soma (Plate II., Fig. 31), it occupies a position just beneath the 

 larger group on the radius. Its pores are generally scattered 

 considerably. When four groups are found on each wing, one 

 of them lies on the subcosta, two on the radius and one on the 

 media. It is common for the distal end of the largest group on 

 the radius of any wing to become attenuated so that a row of 

 pores may extend nearly, if not all, the way to the fold of the 

 wing. The farther this row of pores extends along the radius the 

 farther apart are the pores. It is also common for the largest 

 group on the radius to consist of pores of two sizes. The diam- 

 eters of the larger pores may be two or three times those of the 

 smaller ones. The larger pores extend lengthwise through the 

 center of the group. Eight species (Nos. i, 3,4, 5, 6, 33, 36, 38) 

 have pores as just described. The pores in this group of seven 

 other species (Nos. 10 to 14, 23, 30) are also of two sizes, but 

 there is not such a great difference in the sizes of the smaller and 

 larger pores, as in the pores of the preceding eight species. 

 These pores are also comparatively larger. All the pores on the 

 wings of nine species (Nos. 7, 9, 16, 17, 18, 20, 22, 31, 40) are of 

 about the same size and they are comparatively large. All the 

 pores on the wings of the remaining species are of about the same 

 size, but they are comparatively small. Coxelus, the smallest 

 beetle examined, with 130 pores on both wings has the least 

 number, while Orthosoma, perhaps the largest beetle examined, 

 with 982 pores on both wings has the greatest number. 



The trochanters never fail to possess at least a few pores. The 

 trochanter with, the fewest pores has two, whereas the one with 

 the most has 59. As a rule, the more pores on a trochanter, the 

 smaller they are. The pores are generally located at the proximal 

 end of this segment in about the same arrangement as represented 

 in Epilachna (Text-fig. 2A-F), but occasionally they are con- 

 siderably scattered, and a few may be found at the distal end 

 of the segment. 



A pore was found at the proximal end of one or more femurs 

 belonging to each of 18 species (Nos. i, 2, 4, 7, 8, 10, 11, 13, 16, 



