178 THE CANADIAN ENTOMOLOGIST. 



As regards the third sub-family, Telephoridae, it is merely necessary 

 to mention that the eyes, without being excessively large in either sex, are 

 invariably larger in the £ than in the ^ , and that in the lower forms 

 (Malthodes, Sic.) there is an extreme complication in the development of 

 the last abdominal segments. 



We have, then, in Lycidae a tendency, with simple sexual characters, 

 to elongation of the anterior part of the head. In the Lampyridae the 

 sexual characters are diffused over the whole body, but with no tendency 

 to elongation of the head or complication of the posterior abdominal 

 segments ; and in addition there is a peculiar apparatus for the emission 

 of light, which although absent in some genera, does not exist at all in 

 the other two sub-families. 



Finally, in Telephoridae there is a slight reminiscence of the anterior 

 extension of the head in certain species of Podabrus, which have a broad 

 muzzle. In general the mouth organs are more powerful than in the other 

 sub-families. The sexual characters are of an ordinary kind, but in 

 Chaitliognathus and Malthodes the last abdominal segments of the £ are 

 largely developed. In some species of the last named genus the com- 

 plication of these rings resembles nothing that I know in nature, except 

 the curious structures of Tipulidae figured by Osten Sacken.* In 

 Ichthyurus, an Asiatic genus, the middle legs of the $ are singularly 

 inflated ; and in Silts there are curious processes near the hind angles of 

 the prethorax; a very deep fissure limited on each side by a prolongation, 

 and complicated by a moveable articulated process attached to the inflexed 

 flank of the prothorax. In several species this articulated process ter- 

 minates in a long bent filament, and the apparatus probably serves like a 

 somewhat similar one on the first antennal joint of the $ of the Mala- 

 chide Collops, to clasp the antennae of the % . 



After this statement, which is as brief as I can make it, of the arrange- 

 ment into sub-families and tribes of the Lampyridae, with the principal 

 modifications of structure in each, we are prepared to consider the 

 variations in the light organs, and their sexual correlation with the eyes 

 and wings in the Lampyridae proper. 



We have seen that the greatest development of the eyes takes place in 

 the male of the series A b, or Lampyrini, in which the antennae are very 

 short in both sexes. The female is without wings, and has the eyes 



Proc. Acad. Nat. Sc. Phila., 1859, 197, pi. 3 and 4. 



