122 
Psyche 
[June 
Family Musapsocidae, new family 
Diagnosis. — Antennae of 12 segments. Frontal sutures absent. 
Lacinial tip with three tines composed of the median cusp, the tip 
of the lateral cusp, and a subapical denticle of the lateral cusp. Tarsi 
two-segmented. Pretarsal claws of each foot unlike, the anterior 
claw broadened by a membranous covering or cowl, the posterior 
claw without a cowl and bearing a preapical denticle. Pterostigma 
open basally. Vein 2 A of forewing joining iA or ending freely 
without joining wing margin. First segment of Rs in hind wing 
absent, but two ends of the vein sometimes present. Third ovipositor 
valvula not bilobed apically. 
Genus Musapsocus, new genus 
Diagnosis. — With the characters of the family. 
Type species: M. huastecanus , new species 
Musapsocus huastecanus, new species 
Diagnosis. — Vein 2A in forewing ending freely, joining neither 
iA nor wing margin. Male with three pairs of papillar fields on 
dorsum of clunium, the most posterior pair narrowly separated on 
midline and reaching posterior clunial margin; small median papillar 
field present on dorsum of eighth abdominal segment. Male with 
parameres joined to form slender rod anteriorly. Female with first 
ovipositor valvula bearing a short rounded lobe on mesal margin near 
base; third valvula with no indication of bilobing. Female subgenital 
plate with posterior margin flat; plate lacking T-shaped sclerite. 
Male. — Measurements (Table I). 
Morphology. — Lacinial tip (fig. 6): median cusp showing line 
through tip suggesting it to be slightly bifid. Hypandrium with 
posterior margin thickened and curved. Phallosome (fig. 7) : para- 
meres with basal line of fusion extending nearly to extreme base; 
posterior branching of parameres resulting in ( 1 ) pair of short, 
Explanation of Plate 17 
Fig. 1. — Musapsocus creole, n. sp., 9, forewing. 
Fig. 2. — M. creole, n. sp., 9, hindwing. 
Fig. 3. — M. creole, n. sp., 9, lacinial tip. 
Fig. 4. — M. creole, n. sp., $, phallosome. 
Fig. 5. — M. creole, n. sp., 9, pretarsal claws. 
Fig. 6. — M. huastecanus , n. sp., $ , lacinial tip. 
Fig. 7. — M. huastecanus , n. sp., $, phallosome. 
Fig. 8. — M. tabascensis, n. sp., 9, lacinial tip. 
Fig. 9. — M. tabascensis, n. sp., $ , phallosome. 
Fig. 10. — M. birkenholzi, n. sp., $, forewing. 
Fig. Ill — M. birkenholzi, n. sp., $ , phallosome. 
