1967] 
MacLeod & Adams — Berothidae 
24 
enlarged. Ninth sternite produced, apex bluntly pointed, with tuft 
of vertical white setae; a prominent marginal tooth each side. Ninth 
tergite extends farther ventrad than lateral margins of 8th sternite, 
forming articulation with 9th sternite. Ectoprocts produced, clasper- 
like; callus cerci pale. Lobes between the gonarcus arms with oval, 
well-separated scales; between gonocoxites and a median area ventral 
to mediuncus with larger, imbricate scales; gonocoxites with prom- 
inent tooth on expanded apical portion; free portion of mediuncus 
(fig. 8, mu) bent dorsally, recurved distally. Female (figs. 14, 15, 
16) : ectoprocts short; eighth gonocoxites little sclerotized, anterior 
margin deflexed, incised medially. Accessory gland reservoir bulbous, 
duct connecting reservoir to genital chamber lined with microtrichia. 
Spermathecal duct from bursa copulatrix dilated, large, more weakly 
sclerotized than remainder of spermatheca. Spermathecal coiling 
pattern as in fig. 17. 
Measurements (mm, range, means in parenthesis), n = 8cf, = 
10$: forewing length, cf — 6.7 (7.06) 7.6, 9 — 6.5 (7.08) 8.0; 
body length, cf — 4-7 (5-2) 5.5, 9 — 4.3 (5.1) 5.7 ; antenna length, 
cf — 3-5 (3-7) 4-L 9 — 2.7 (3.0) 3.1; tenth flagellar segment (two 
of each sex measured), cf — length 0.11, width 0.06, 9 — length 
0.08, width 0.06. 
Leg segments of a cf with a 7.6 mm forewing: coxae -74/.55/.48; 
femora 1.02/.98/1.15 ; tibiae 1 .0/1.1 7/1. 92 ; tarsi .83 (.28 — .16 — 
.12 — .09 — .16V.65/.78. 
Sexual dimorphism, common in some berothids, is limited to the 
larger eyes, proportionately narrower face, longer antennae with 
more, elongate segments, and shorter cervical sclerites in the male. 
No squamae or other setal modifications are present in either sex. 
Holotype, a pinned cf : Coquimbana, North of Huasco River, 
Atacama, Chile; x-20-1957; L. E. Pena, collector (Museum of 
Comparative Zoology, Harvard University — type #31568). Para- 
types (all coll, by L. E. Pena) — Atacama, Coquimbana, N. of 
Huasco R.; x-20-57: 19. Quebrada Algodon, near Carrizal Bajo; 
X-18-1957: 8cf, 569- x-20-1957: 19. Coquimbo, Tofo; x-27- 
1957: 29. (U. S. National Museum, British Museum (N. H.), 
Adams Coll., MacLeod Coll., Tjeder Coll.). 
The gut contents of two specimens consist of pollen grains of 
Salix (identified by D. L. Walkington). 
Discussion. Perhaps the sclerites which we have identified in the 
female as separated fragments of the 8th sternite could be equally 
as well regarded as derivatives of the 9th tergite, but since an 8th 
