12 Transactions of the Academy of Science of St. Lows 
mented or the fourth antennal segment is as long as the whole 
body ; otherwise the antennae are four segmented and the fourth 
segment is much shorter than the body. Unguiculus and furcula 
always present. 
GENUS Entomobrya Rondani, 1861 
Pigment well developed and often present in a definite pat- 
tern; tenent hair well developed; mucro with an apical and a 
subapical tooth and a basal spine; without scales; eyes eight on 
each side. 
Entomobrya purpurascens (Packard), 1873 
Figures 48-52; length 1.5 mm.; white or yellow with black 
markings; tenent hair numerous on the dorsal surface of the 
head, mesothorax and metathorax, but less numerous over the 
rest of the dorsal body surfaces; prothorax without markings; 
mesothorax with darkened areas laterally near the base of each 
leg; metathorax with posterior parts and lower lateral parts 
heavily chitinized and darkened; posterior half of first abdominal 
segment with an irregular transverse band; second abdominal 
segment entirely darkened except for a narrow strip on the an- 
terior dorsal part; third segment entirely darkened but for a 
small anterior dorsal part; fourth segment with a broad irregular 
darkened transverse band over the entire surface except for 
an irregular anterior dorsal region; fifth and sixth segments also 
darkened; entire body covered with many short setae, furcula 
extending to the ventral tube, dentes dorsally crenulate, mucro 
with an apical and a subapical tooth; ommatidia nearest the 
bases of the antennae on each side with 16-19 small round black 
bodies; unguis with 3 inner, 2 lateral and one outer teeth; un- 
guiculus slender and two-thirds the length of the unguis; an- 
tennae about twice the length of the head, segments to each 
other as.1, 19, 18 2:2. 
