Scpt.-Dec, 1921.] Weiss-Dickerson : ^Milkweed Insects. 133 



ico, ill July, 1905. ami youni,'^ of both species were found feeding on 

 alfalfa. They have been observed to attack cotton squares and 

 bolls. Milkweeds (Ascicpius spp.) seem to be the natural food 

 [.lants of both of these species." 



Egg. Heidemann (Proc. Ent. Soc. Wash.. Vol. XIII. no. 3, p. 

 [33. 191 1 ) has the following to say al)out the ef:::^^. " Oncopcltus 

 jasciatus has oval-elongate eggs, a little shorter in size than those of 

 the preceding species (Bclonochiliis Jiiimcuiiis). The chorial process 

 IS very short and thin at the base and the round downward-bent por- 

 tion quite big; there are 12 processes surrounding the u])i)er end 

 of the egg. The outer chorion smooth, yellowish-red."' A drawing 

 of the egg accompanies this reference. 



Last St.age Nvmi'ii. Length 9 to 11 nun. Width, 3.5 to 4 mm. 

 Elongate oval, widest across middle portion of abdomen, tapering 

 gradually to head; posterior portion of abdomen broadly rounded. 

 Head triangular, obtusely angled in front, slightly rugose, with more 

 or less pronounced, median, dorsal, slight, broadly rounded ridge ex- 

 lending from apex to middle portion, posterior to which is a slight, 

 curved, transverse depression. Antennre linear, finely pubescent, 

 about one half as long as body, inserted laterally, four jointed, 

 basal joint short, second three times as long as basal, third shorter 

 than second, distal joint equal to second and obtusely rounded. Eyes 

 lateral, prominent. Prothorax almost twice as wide as long, anterior 

 margin concave, sides straight gradually widening to posterior mar- 

 gin which is subconcave. Mesothorax slighdy wider, with wing- 

 pads reaching posterior margin of third abdominal segment. Lateral 

 margins of wing-])ads slightly rounded. Sides of abdominal seg- 

 ments slightly rounded. Rostrum lour jointed reaching beyond 

 posterior margin of thorax. Legs finely pubescent, comparatively 

 long and slender. Color, reddish orange except for the following 

 portions which are dark to black ; — antenna;, legs, rostrum, ui)per 

 portion of head (in most specimens), eyes, posterior margin of pro- 

 thorax, lateral 4)ortions of dorsum and all of the wing-pads of the 

 mesothorax. lateral sjjots on all of the abdominal segments and me- 

 dian dorsal spots on the fifth, sixth, seventh, eighth and ninth ab- 

 dominal segments, apex of ventral abdominal surf.ict.-. 



Adult. Oncopcltus fasciatiis. This sjjecies was named by Dallas 



