292 
Psyche 
[Vol. 90 
late processes, the processes of the posterior row being reduced, 
basal lateral margins posterior to other lateral tubercles with single 
tuberculate process, each process bearing a single long seta; the 
remaining thoracic segments and abdominal segments 1-8 bear dor- 
sally two transverse rows of six multiply tuberculate processes, each 
process bearing a single long seta, segment 9 possesses an anterior 
row of three and a posterior row of two processes similar to those of 
the other segments, lateral margins of all segments with 2-3 large 
palmate tubercles bearing 1-2 long setae; urogomphi similar in form 
to the lateral processes, multiply tuberculate and bearing 2-3 long 
setae; spiracles biforous, bourne on short tubes. Legs well-developed, 
with five segments, coxae moderately separated, tarsungulus with 
two short adjacent setae. 
This is the first member of the genus to be formally described. 
Peacock (1977) presents a brief description without figures. Her 
diagnosis agrees with the features described here for M. producta. 
Corticaria valida Fall 
(Fig. 4) 
This species is quite distinctive and fits the characters presented in 
the key and description of Fall (1899). This identification is tenta- 
tive, however, since the type localities of Fall were the Midwest and 
Rocky Mountain states. Last instar larva: length 2. 5-3.0 mm. Body 
elongate, cylindrical, whitish with scattered long setae abruptly 
expanded and flattened at apex. Head slightly declined, with scat- 
tered modified setae, the few aciculate setae on or near anterior 
margin, labrum free, four stemmata to each side, three in vertical 
row, the fourth posterior to the lowest stemma, epicranial suture 
moderately long, frontal arms broadly V-shaped; antennae three- 
segmented, sensorium as long as third segment, second segment 
twice as long as first; maxillae and labium fused at base, maxiliary 
palps three-segmented, mala with acute hook at apex, labial palps 
one-segmented; mandibles lacking apical teeth, with lateral enlarged 
fleshy lobe bearing two long setae at apex, mola enlarged, with 
series of fine teeth over surface; hypopharyngeal sclerome short, 
distinct. Thorax and abdomen dorsally with smoothly raised circu- 
lar sclerotized patches bearing 1-4 modified setae, abdominal seg- 
ments 1-8 with row of six sclerotized raised areas each bearing three 
