FAMILY ZYG^ENID^S. 45 



median. Inner edge very short, being one-half as long as the 

 costal. First and second subcostal nervulcs nearly equal in 

 length. The upper discal is very long and oblique, and with 

 the lower discal is parallel with the outer edge of the wing. 

 But three median nervules present. First, obsolete ; second 

 and third parallel ; third and fourth shorter than the second and 

 directed downwards. Distance between the two first median 

 nervules one-third as great as that between the third and fourth. 



The slender abdomen is a little more than twice the length 

 of the head and thorax. The male genital armor is large and 

 well developed in the genus. The two tergal pieces consists of 

 a semielliptical horizontal piece, beneath which comes out 

 another tergal piece of the same length, but linear, and curving 

 downwards and inwards. The side pieces are large, concave, 

 broad and lono;. nearly meeting beneath, along the mesial line 

 of the body. Each piece is widest in the middle, thence nar- 

 rowing rather rapidly, becomes truncate at the extremity, end- 

 ing in a pair of hooks separated by a deep sinus. 



The coloration is prussian blue, with saffron bases to the 

 wings, somewhat as in Pyromorpha. . 



Compared with other genera of the subfamily this inter- 

 esting genus presents some notable differences, all the characters 

 being, as it were, influenced by the close relationship to the Litho- 

 sise. This is seen in the dentated antennae, neither simple as in 

 the Lithosise, or pectinated as is the rule in its own group. 

 The Lithosian characters also appear in the head, in the form 

 of the clypeus especially ; and in the unusually slender body, 

 with its narrow wings, and elongated scutellum of the meso- 

 thorax. Though after all the Zygsenid characters prevail so 

 extensively that it is a little strange that observers after Dr. 

 Harris' time should change his location of the genus to a 

 place among the Lithosiidas. Though the larva is a lichen- 

 feeder and thus in this early stage is like Lithosia and allies, 

 we must consider the insect as simply analogous in its habits as 

 well as structure to that genus, and not be misled by these very 

 strong resemblances. 



I have taken L. Pholus on the wing in the daytime about 

 stone walls on which lichens were plentiful, in Brunswick, 

 Maine. 



Anatolmis nov. gen. 



Head of moderate size, broad and short. Occiput and epi- 

 cranium together equal in length to the clypeus ; epicranium 



