IOWA ACADEMY OF SCIENCE 
245 
spines at the apical angles; fourth segment with a stout spine; last 
dorsal segment of female truncate at apex 5. clavata Guer. 
1. H. siMiLis 8tal. Mexico. 
2. H. nuLCHEiPES 8tal. West Indies. 
3. H. FusciNEBVis Champion, Mexico and Central America. 
4. H. ACANTHAKis I/mw. West Indies. 
5. H. CLAVATA Guerin, West Indies. 
50. ARILUS Hahn. 
Champion 267; Stal (f) 67, 72 (Prionotus), 
Arilus B.ahi[L=Prionotus Laporte=Priowidws Uhler, the two latter names be- 
ing preoccupied. 
Species of this genus are easily distinguished by the presence of a high mesal 
tuberculate ridge on the pronotum. 
1. A. CBiSTATTJS Linn. i=novenarius Ssiy^denticulatus Westw. =patulus 
Walker) New York to California and south. Posterior lobe of pronotum con- 
vex and strongly cristate with 8-10 tubercles on the crest; margins of abdomen 
distinctly sinuate. This is a common insect in the southeastern states. 
2. A. DEPBESsicoLLis 8tal. Mexico. Posterior lobe of pronotum flattened and 
feebly cristate; margins of abdomen feebly sinuate. 
3. A. CABiNATus For St. {^serratus ¥Ahv.=xanthopus Walk.) West Indies. 
12-14 tubercles are found on the crest of the pronotum; the pronotal margins 
are distinctly dilated behind the posterior lateral angles. 
51. STHIENERA Spinola. 
8thienera Spinola (117); Champion (269); Piezopleura Am. et S. (362); 
JIarpactor Stal (f. 68, 72; b, 47); Erhessus Stal (f. 73). 
It differs from other Reduviids in having the anterior tibiae toothed near 
the apex beneath. 
S. BHOMBEA Erichs, i^rhomheus Stal). Mexico. Pronotum and legs are 
fuscous, scutellum and elytra flavescent. 
Note. — Harpactor americanus Bergroth (b) is placed by Bergroth in Harpactor 
Laporte (nec Stal) i=Reduvius Pabr., Stal, nec Lamarck.) 
This species and consequently the genus were overlooked during the prepara- 
tion of this paper and are found too late to be discussed. 
52. ACHOLLA Stal. 
Stal (f) 67, 72, i=Ascra Stal); Champion, 289. 
All three species of this genus occur in North America. 
a. Head elongate, post-ocular portion tumid anteriorly; pronotum broader 
than in other species, somewhat tuberculate 1. multispinosa DeG. 
aa. Head shorter, lateral angles of pronotum obtuse; ante-ocular portion of 
head and anterior lobe of pronotum with prominent conical tubercles: 
head not tumid 2. ampUata Stal. 
aaa. Head shorter; lateral angles of pronotum rather sharp; ante-ocular por- 
tion of head and anterior lobe of pronotum only slightly tuberculate 
3. tabida Stal 
l. A. MULTISPINOSA DeQeer is the common North American species. It is 
very similar to the other two. New England to Nebraska. X=sexspinosus Wolff 
=su'barmatus H.-Sch.) 
