': Springtails :(Collembola) of the St. Louis Area. 11 
siete edt 2s nipiiieedmials armatus a cleat 
7 Figure 3 Ps tenth Pe 1.5 mm; black: frente niall. soueniie 
4. -segmented, subequal to the jenet i the head, segments to 
each other as 1, 1.2, 1 .2, 1.4; short setae covering the body, and 
a few longer setae near the tidal part of each segment dorsally ; 
unguiculus absent; one long knobbed hair above the unguis on 
the distal end of thé tibio-tarsus. Records: March 3, a Ranken, 
Mo., Ae Fe peg eee 
| Onychiurus subtenuis Folsom, 1917 
Figures 3-6; length up to 1.8 mm.; white; body covered with 
minute tubércles. and a few long: sete distinct. body segments ; 
segments subequal; no furcula; two anal spines which appear 
quite long because they. are located on prominent tubercles; 
unguis about as long as the anal spine and with one or two 
teeth on the j inner surface ; no tenent hair; unguiculus spine- -like, 
with a basal lamella; antennae 4-segmented, segments to each 
other as i, 14, 16, Bs third segment wt a distinct notch near 
the distal end. 
tas Thea h ue the third antennal segment and the prominent 
anal horns which: are as. long or slightly longer than, the hind 
ungitis are characteristics useful in identifying, this species. This 
is a common. species in the St. Louis area, and.is found in leaf 
mold and rich humus. Reported by Mills (1934) as found also 
in Illinois, New York, Pennsylvania, Utah, Ontario, Records: 
aoe 15, 1936, Buder Park, one mile southeast of Valley Park, 
(Leslie Sarin) November gel 1937, Ranken, Mo., 
(E 'D. Earls 
-Sebfamily Entamobryinae Sehie, 1896 » 
The eens abdominal segment usually saci longer than the 
third dorsally, if subequal then the antennae are five. or. six:segr 
