28 



groups, each of which seems to bear more relation to one of the preced- 

 ing groups than to the other subdivisions of its own section. 



The first subdivision shows in the shape of the Uncus great affinity 

 to califoniiata Pack., in fact the palpi themselves are only slightly 

 longer than we find in califoniiata 9 "s and the species might almost 

 as well be placed in the preceding section. 



Our S material in this group is very limited and we do not feel 

 at all sure but that with more material and better knowledge of the 

 type specimens some of our conclusions may have to be altered ; how- 

 ever we give our opinions for what they may be worth and trust that 

 those more favorably situated with regard to material than we are will 

 be spurred on to test the correctness of these conclusions. 



III. Long Palpi Group. 



Hydriomena BisTRiOLATA Zell. ( PI. V, Figs. 3, 4; PI. IX, Fig. 5). 

 The type of this species is a 9 in the Zeller Collection in the 



British Museum; according to Zeller, Packard and Swett (Can. Ent. 



47, p. 59) there is in the Cambridge Museum a 9 (not a 5 ) which 

 may be possibly considered a Paratype as it 

 bears a yellow label indicating that it had been 

 examined by Zeller; Packard figures a speci- 

 men from St. Louis, Mo., which he had com- 

 pared with this latter specimen and found to 

 agree (Mon. Geom. p. 95, PI. VIII, Fig. 32). 

 I'iG. 8 We have a single $ from Decatur. 111., 



Uncus of H. bistrioUita ... ,, • , -r* i i' i^ -.1 



which agrees well with Packard s figure and 

 which we imagine therefore may be referred to this species; it shows 

 only a faint tinge of green on the pale areas whereas typical bistriolata 

 is strongly suffused with this color, but a series would probably show 

 considerable variation in this respect. We figure the Uncus, drawn 

 after an examination under the binocular, our material not permitting 

 of any slides being made ; Mr. Swett has kindly sent us a sketch of the 

 Uncus of two <5 "s in the Cambridge Museum from Dallas, Tex. (Boll), 

 probably part of the type lot, which agrees with our figure so that we 

 imagine our identification is fairly certain ; it will be seen that the fork 

 is very deep and strongly U shaped, each branch being thickened and 

 slightly bent inward toward apex ; it would seem to be a further devel- 

 opment of the califoniiata type. The species has only been taken in 



