IOWA ACADEMY OP SCIENCE 
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2. F. APTERA 8tal i=nigrovittata Stal). New Jersey to Colorado and Texas. 
Pronotum unarmed. Both apterous and winged forms known. There is a 
conspicuous black vitta on the median dorsal part of the abdomen in this form. 
43. SOSIUS Champ. 
Champion, 275. 
Sosius approaches Rocconota but differs in the acutely angled, foliaceous 
plate-like dilatation of the fifth and sixth abdominal segments. Monotypic. 
S. FOLiACEus Champion. Mexico. Spines on the upper part of the head long 
and curved forward; those on the genae short. 
44. CASTOLUS Stal. 
Stal (f) 69, 80; i=8pinda Stal); Champion, 278. 
This is a tropical American genus, the five species of which may be separated 
as follows: 
а. Lateral angles of pronotum unarmed and not dilated. 
b. Entire head, (or at least the post-ocular portion in one variety) rufous 
above; no red on elytra; femora orange in color; tibiae black 
1. plagiaticollis Stal 
bb. Head black; margins of elytra rufous; basal half of femora fiavous, 
tip and entire tibiae black 2. tricolor Champ. 
. aa. (See also aaa.) Lateral angles of pronotum armed with a tooth. 
b. Lateral pronotal angles with a very short tooth; three black spots 
on yellow pronotum.... 3. trinotatus Stal 
bb. Lateral pronotal angles with a rather long, stout, tooth; elytra and 
disc largely fuscous; no black spot on posterior lobe of pronotum.... 
4. suhinermis Stal 
aaa. Lateral angles of pronotum subangularly dilated, caudal and lateral 
margins sanguineous; legs black or brown.... 5. rufomarginatus Champ. 
1. C. PLAGIATICOLLIS 8tal. Mexico. 
2. C. TRICOLOR Champion. Mexico. 
3. C. TRINOTATUS 8tal. Mexico. 
, 4. C. suBiNERMis 8tal. Mexico. 
5. C. RUFOMARGINATUS Champion. Mexico. 
б. C. FERox Banks (b), was described from Arizona as Zelus ferox. No 
characters are given which would place it in that genus. A specimen in the 
collection of the Illinois State Laboratory of Natural History which answers 
Banks’ description in detail and comes from Arizona is an undescribed species 
of Castolus. Black tubercle over base of antennae, femora with black annulae, 
body yellow. 
45. HIRANETIS Spinola. 
. Spinola, 112; Stal, (f) 69, 82. 
These are slender insects resembling Ichneumon flies, mainly light yellow in 
color. Seven tropical American species have been described. 
H. BRAcoNiFORMis Burm. (=pompiloides Burm.) is a variable species. Femora 
more or less annulated with black; pronotum varies from fiavous to piceous; 
el;ytra fuscous with a transverse piceous band midway between base and apex. 
