186 GROTE & ROBINSON. 



defined ; the oblique and even dark subterminal line is absent ; the 

 reniform spot is very much smaller and differently shaped, being nor- 

 mal, whereas in E. poeyi it is elongated and completely divides the 

 white field of the wing • the orbicular spot is absent in E. poeyi, in 

 which species also the secondaries and both wings beneath are of a 

 paler yellow, the primaries with a single discal mark, and the second- 

 aries without a discal dot on either surface. The discovery of the 

 male of this fine species will be attended with interest in view of the 

 great structural disparity between the sexes of E. poeyi. 



In dedicating this species to Prof Glover we pay a very willing 

 tribute to the scientific zeal and industry of the gentleman. 



Subfamily Zygaeninae. 



' CYDOSIA, Westw. 



Cydosia aurivitta, n. s. 



% 5 . — Entirely cyaneous black, lustrous, beneath less shining and 

 more of a dead black. The male abdomen has the anal segment ringed 

 with bright fulvous scales. Anterior wings with a golden yellow stripe 

 on costa at base ; a subbasal stripe running transversely downward 

 from m. nervule to internal margin, sometimes resolved into two spots 

 by its obsolescence on internal nervure. On the disc a subquadrate 

 spot and a gently sinuate even transverse band before the margin. All 

 these markings are very broad, evident and concolorous, being of a 

 deep gold color. Elsewhere the insect is entirely immaculate, gene- 

 rally cyaneous, sometimes greenish black. 



Expanse, 22 — 24 mil. Length of hodi/, 7 — 8 mil. 



Habitat. — Texas, (Belfrage). Imago flies in May and June. 



Though at first sight diflfering very greatly from its ally taken in the 

 same locality, C. nobilitella, ^YestK•., it is in reality near it, wanting 

 merely all the numerous determinate white maculations on the body 

 and wings which characterize its congener. The present genus we re- 

 gard as related to Apistosia Hiihner, and forming one of a low group 

 of Zygaenid genera with simple antennae and elongate wings, which 

 latter, when at rest, the imago folds after the manner of Lithosia. 

 This group is so laden with Lithosian analogies as to render its critical 

 study difficult. C. nobilitella and Oeta compta mimic the Lithosian 

 genus Utetheisa. Deiopeia aurea Fitch, is probably a species of Cy- 

 dosia. On the other hand, Apistosia Hiihn., (A. humeralis Grote, 

 and A. judas Hlibii.,') is a West Indian and South American genus 



