86 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 95 
In the female of both arctifasciatus and nothoproctae there is a 
decided horizontal slit on the side of the head slightly behind the 
tip of the antennae. This slit is more pronounced in aretifasciatus, 
while in the male of nothoproctae it is completely closed, there being 
but a trace of it visible. The male genitalia are simple, consisting of 
a basal plate, semimovable paramers, and rigid endomeres, the 
paramers being attached on the side of the basal plate, while the latter 
extends nearly to the tips of the former. 
The discovery of another species of Menacanthus on another genus 
of Tinamidae creates a puzzling situation. They are the only species - 
of Amblycera known to be parasitic on this family of birds, so that 
they are undoubtedly of much more recent acquisition than the multi- 
tude of complex genera and species of Ischnocera found so abundantly 
on them. 
MEASUREMENTS OF MENACANTHUS 
M. nothoproctae M. arctifasciatus 
Structure Male Female Female 
Length | Width | Length | Width | Length | Width 
BOG eee Se SUIS U8 ALM OMT DA Giy | ois Ua PRD [ii Mt alae 2.01 
N25: ¥ Paarey ARPT NRO dN UCR RETERS SN Eg RE S| 0. 33 0. 50 0. 37 0. 53 0. 35 0. 55 
(Prothoray 2k eS a NEA ee 0. 21 0. 37 0. 26 0. 42 0. 23 0. 40 
Meesothorax: 22a A a lea 0.17 0. 44 0. 23 0. 51 0.17 0. 50 
WMreta thorax) eae A 2D) OTe 0. 09 0. 47 0. 11 0. 58 0.13 0. 56 
JA DGomen os Oe PES eee ee a SE 1.06 0. 58 1.11 0. 82 1. 33 0. 83 
Genitalia OLA AE RTE AEN 0. 32 O08 5)| eee Poe TRAN (I ed SE 
In nothoproctae the paratergal plates are more heavily pigmented 
than the tergites, while in arctifasciatus the two are more or less of the 
same pigmentation but are separated by a narrow hyaline space. 
Suborder ISCHNOCERA Kellogg 
Family PHILOPTERIDAE Burmeister 
TINAMOTAECOLA, new genus 
Genotype.—Tinamotaecola andinae, new species. 
Head circumfasciate, with pronounced antennal fossae and concave 
occiput; small fixed trabeculae; antennae simple, similar in the sexes, 
with second segment the longest and the last three subequal. 
Transverse clypeal suture present, but fused at the sides; clear 
postantennal suture running diagonally backward from base of an- 
tennal bands to sides of occiput; narrow clypeal band completely 
