i^OV 28 1988 



Kansas University Quarterly. 



Vol. II. OCTOBER, 1S93. No. 2. 



The Sclerites of the Head of Danais arch- 



ippus Fab. 



BY VERNON L. KELLOGG. 



(With Plate II.) 



In some published *notes for the guidance of students in the ento- 

 mological laboratory of the University of Kansas, giving some details 

 of external insect anatomy the head and thorax of the common milk- 

 weed butterfly {Danais archippus Fab.) were described. Further 

 study of the sclerites of the head of archippus shows the necessity of a 

 revision of parts of the Notes. As some of these parts are based on 

 earlier and generally accepted descriptions it seems worth while to 

 call attention to certain of these changes. 



THE FIXED PARTS. 



Eyes. 



Of the fixed parts of the head of archippus the compound eyes are 

 conspicuously large, each one constituting about one-third of the 

 head (see eye in fig. 11, Plate II). There are no ocelli. 



Clypeus. . 



The rounding, tumid clypeus makes up the larger part of the front 

 aspect of the head (see el in fig. 11, Plate II). The clypeus ex- 

 tends upward to the antennary fossse, and as a short, broad tongue 

 between them to a suture running transversely from fossa to fossa. 

 This suture is plainly apparent in simply fdenuded specimens or in 

 |bleached specimens. In this point, as well as in a few others, my 



*Kellogg. Vernon L., Notes on the Elementary Comparative Anatomy of Insects. 1892, 

 Lawrence, Ivas. 



+Riibblng with a soft, pointed brush, assisted by gentle manipulation with a needle or 

 delicate forceps will soon denude the head of its scales. 



tl And the most satisfactory method of bleaching the heads to be this: boil for a few 

 minutes in potassium hydrate until the eyes become light-brown; then wash, and transfer 

 to eau de Labarraque, in which fluid the head will soon reach the desired clearness. 



(51) KAN. UNtV. QUAR. VOL. II, NQ, 2, OCT., 1893. 



