SCUTELLEROIDEA OF IOWA 101 
pubescent, dotted with fuscous, the apex of tibiae and all the tarsal seg- 
ments black. Length, 8.5-11.0 mm. Width across pronotum, 5.0-6.0 mm. 
The general coloration of this insect varies from a very pale 
yellow to almost a uniform fuscous. The punctuation of the 
seutellum and pronotum also varies considerably, some individ- 
uals possessing a much greater number of smooth areas than 
others. 
This peculiar western form was first recorded from the state 
by the writer in 1916 (J. c.), when two specimens were listed. 
A female from Ft. Madison was collected June 30 and on Octo- 
ber 30 a male was taken near Iowa City. The Ft. Madison 
specimen was swept from weeds growing in a sandy unculti- 
vated area along the edge of woods. The Iowa City specimen 
was found under the leaves of a muilein plant growing in a 
sandy cultivated area. 
These two specimens form the only available Iowa records. 
Zimmer records four examples from Nebraska and I have a num- 
ber of specimens from Missouri. All the other records of which 
IT am aware are from Colorado or farther west. Here again we 
have an illustration of the tendency on the part of one of the 
typical western forms to spread to the eastward where favor- 
able environmental conditions may occur. 
Genus THYANTA Stal 
1862. THyanta Stal, Svensk. Vet. Handl., 3, no. 6, 58. 
This genus, containing about eighteen forms, is confined to 
the Nearctic and Neotropical regions. Nine forms are recorded 
from the United States while but a single species has, as yet, 
been recorded from Iowa although it seems lkely that one or 
two more should occur within the limits of the state. The chief 
generic characters may be thus summarized: 
Body obovate. Head ovate, somewhat flattened, slightly sinuate before 
eyes; juga not longer than tylus; sometimes the tylus slightly exceeds the 
juga. Antennal tubercles visible from above. Rostrum extending to or 
behind postcoxae, the first segment equal in length to the bucculae. Meso- 
sternum carinate. Ostiolar openings continued laterally in a gradually 
disappearing wrinkle. Base of venter unarmed. Apex of corium with a 
distinct lateral angle. Tibiae above almost flattened or widely and weakly 
suleate. 
