STUDIES IN NEOTROPICAL MALLOPHAGA—-CARRIKER 173 
temples and frons are slightly larger and the templar margins slightly 
more sinuate; the abdominal sclerites and markings are similar, while 
the chaetotaxy is exactly the same except on segment VII (see figure). 
Measurements are given with those of &. andinae. 
RHYNCOTHURA ANDINAE, new species 
F1iGuRE 19, d—f 
Types.—Male and female, adults, from ZTinamotis pentlandi, col- 
lected by the author at Potosi, Bolivia, January 23, 1938; in collection 
of author. _ nye 
Diagnosis.—This is the smallest species of the genus now known and 
decidedly different from all others in many characters. Like teres 
and subteres it has no internal projections on the frons and very few 
markings on the head and thorax and none at allonthe abdomen. The 
head is very large, much larger than the combined thoracic segments, 
while the abdomen in both sexes is very small. The thoracic structure 
is also unique. The three segments are very closely fused, even the 
prothorax and mesothorax, where the suture is extremely difficult to 
distinguish, especially in the male. The suture between the meso- 
thorax and metathorax is also very short (at sides only) and almost 
invisible. The sexes are strongly dimorphic, not only in the antennae, 
but in the shape of the head (see figure). 
MEASUREMENTS OF RHYNCOTHURA 
chacoensis andinae 
Structure Male Female Male | Female 
ne 
Length} Width |Length Width Length | Width |Length | Width 
Bod yt tet en hd ee CHIN? 1 Re ee PED RAY 1.06 | SU NE 1. 26 
AT ONS See pias Apel ae lah wish ell g Wars EN ay 0.314 |_-_-__-- 0.347 |__--___- OF B80) Hg eses xe 0.41 
FFTCAA tM Pes e i ewe Nn LL Monet Us 0. 38 0. 53 0.39 | 0.51 0. 36 0. 45 0. 40 hy 49 
OCCIPUT SSA Sea aie dN EN a ak aD ON305))| eee eae ON3G!| Hee Soe 0: 386 f-2 2-2 0. 40 i 
Prothoraxiy¢f4_ sys tee deeaieen ees 0. 11 0. 30 0. 12 0. 27 0. 11 0. 25 0. 09 0. 25 
IVFESOLMOTA XT Ses hee tories (Le ae 0. 18 0. 50 0.19 | 0.49 
Mie tathoraxt S20vk oo she enh We ho Mac 0. 13 0. 44 0. 13 0. 39 Weed Wags Uoease Ones 
Abdomen eis js sseboe eb ele. 0. 69 0. 63 0. 70 0. 62 0. 57 0. 52 0. 69 0. 55 
PAIN TOTITI A Cette een ee ed MIA MERE 0D 0.206 | 0.055 0.16 | 0.038 | 0.195 0. 06 0. 155 0. 03 
Paramers!iss Mahee he sok NAVE i O5078. 4)" OnO7s ease aee BE eA OMIOS 1 OnQoo)| 07108 0. 02 
Endomeral plate. __-.-.-..---------- ONO7Gi Os OSS gees ea i aie ty 
The genital armature of the male is also somewhat unusual in its 
extreme simplicity, the endomeral plate being long and slender, with- 
out lateral thickened bars or rods, and with only a horseshoe-shaped 
support at its base. The basal plate presents an unusual character, 
in that the inner margin of the lateral bands seems to be folded back 
(see fig.). All four males taken show this character. 
