IOWA ACADEMY OP SCIENCE 
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dorsal segment; lateral angles of pronotum slightly 
acuminate 8. rileyi Mont. 
ff. No pale fascia on abdomen; lateral angles of pronotum 
more acute than in two previous species; spines on head 
prominent 9. spinipes H.-Sch. 
1. S. DiADEMA Fabr. (=muUispinosa StSLl=Mspida Th\im.h.=raptatorius Say 
^celosus Gmel.) is an inhabitant of the greater part of North America from 
Quebec to southern Mexico. The individuals vary greatly in size and color. 
2. S. UNDULATA JJTiler may be a variety of 8. diadema for the males of the 
two species are inseparable. The color varies greatly. California and Mexico. 
3. S. coEONATA Stal. California and Mexico. This is the most elongate 
species of the genus. 
4. S. EAPTOEiA Stal. i=denticulosa Stal). California, Texas, Mexico, Costa 
Rica. Champion is authority for the synonymy of the two species. 
5. S. INTEGEA Stal, Mexico. 
6. S. SANGUisuGA Stal. Mexico and Florida. 
7. S. DEFECTA stal. Mexico. 
8. S. EiLEYi Montandon. Colorado. 
9. S. SPINIPES H.-Sch. Texas and eastward. Probably includes S. rileyi 
Mont, as the distinguishing characters are somewhat indefinite. 
10. S. coMPLEXA Caudell (a) is a western species described from California 
and Arizona. 
11. S. coNFusA Caudell (b) from Arizona has heretofore been confused with 
undulata and diadema. 
