28 COLLEMBOLA OF MINNESOTA 



b. Furcula not fanlike, lateral rows of bristles on dentes 



rather short, mucrones broadly elliptical, ribbed. Back 



without long bristles. Smaller claw bearing a branched 



hair at tip. Length i mm. penicillifer, 55. 



5. a. Large claw enclosed in a tunic, which gives it a plump 



appearance. Ant. IV about as long as I, II and III to- 

 gether. Mucrones dentate. Length 2 mm. 



fuscus, 53. 

 b. Large claw not enclosed in a tunic. 6. 



6. a. Ant. IV little longer than III. Mucrones dentate. 



Body beautifully marbled, sparsely covered dorsally with 

 long, much-curved bristles. Length i.5mm. 



minnesotensis, 52. 



b. Ant. IV about as long as II and III together. Mucron- 

 al edges smooth. Body dark, without dorsal bristles but 

 with short, fine hairs. Length I mm. 



pruinosus, 48. 



7. a. Back set with strong, truncate bristles. 8. 



b. Body short-haired, without bristles, often nearly naked. 

 9- 



8. a. Three or four clavate hairs present on the tibia, also 



several very long ones on the dentes. Ant. II equalling 

 III in length, each of these segments bearing a few long, 

 straight bristles. Length 1.25111111. 



longisetis, 51. 



b. No clavate hairs on tibia or dentes. Ant. II shorter than 

 III, long bristles not present. Length 1.25111111. 



curvisetis, 50. 



9. a. Body black, sometimes with bluish or brownish tint, 



bearing four white spots dorso-laterally, and with two 

 small white spots mediad to the eyespots. Length i mm. 



quadrimaculatus, 45. 

 b. Body without the four white spots. 10. 



10. a. Body yellow, sometimes darkening to orange or olive, 



young specimens darker. Eye-spots and a frontal spot 

 between the bases of the antennae black. Length mini. 



aureus, 43. 

 b. Body dark. n. 



