108 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 95 
seoment V abruptly narrower than IV, a character that renders it 
easily recognizable and that is shared (to the same extent) only by 
S.c. interruptus. 
Male: Differs from interruptus in having the lines of the sides of 
the head and temples all shghtly convex, while in interruptus they 
are perfectly straight. The aborted segments alongside the last ab- 
dominal one are of different shape, less rounded on the posterior mar- 
gin and less protuberant. The chaetotaxy and the double, longitu- 
dinal bands across pleurites I to IV seem to be about the same. Both 
races have the head narrower at the temples in the female, as well 
as the frons more rounded. In the female of interruptus the meso- 
thorax has the sides more divergent, extending farther from the sides 
of the abdomen, which is also true of the male in a lesser degree. 
The whole basal plate is narrower, while the paramers are wider 
across their bases and slightly longer, and the endomeral plate is 
wider. The whole insect averages longer and wider, having the 
measurements of the various segments equal to or greater than the 
maximum for the series of interruptus. This race is not particularly 
well marked, but the differences, while slight, are constant. In view 
of the considerable individual variation in measurements in this group, 
care must be taken in basing subspecific differences on size alone, and 
then only when there is a sufficient series to determine individual 
variation. 
MEASUREMENTS OF STRONGYLOCOTES COMPLANATUS 
boucardi interruptus 
Structure Male Female Males Females 
Length Width)Length | Width| Length Width Length Width 
NS XOXO reer PEN A) eae AI DIAG eT Hines EEN at 32.08) 2s Pda ORT | AY i 2. 88-3. 04 
Mop 2G WAS od 0.78 | 0.69 0.81 | 0.67 0. 73-0. 78 | 0. 59-0. 55 | 0. 76-0. 79 | 0. 59-0. 65 
Prothoraxcne erat ages 0.35 | 0.56 0.39 | 0.57 | 0.33-0.40 | 0. 48-0. 54 | 0. 35-0. 43 | 0. 54-0. 54 
Mieso thorax see lia 0. 56 | 0. 84 0. 59 | 0. 79 0. 50-0. 54 | 0. 65-0.79 | 0. 50-0. 56 | 0. 72-0. 85 
Metathoracic apron__-_-____- 0.29 | 0. 56 0.29 | 0.56 0. 26-0. 30 | 0. 50-0. 54 | 0. 28-0. 30 | 0. 54-0. 58 
Abdomen: eeGn i aoe 1.60 | 1.37 1.75 | 1.28 1.35-1.45 | 1.00-1.18 | 1. 61-1. 66 | 1. 18-1. 26 
AN Ger ae Meier eh. i Sk 0.52 | 0.065 0.46 | 0.065 | 0. 45-0. 50 |--.-------- 0. 41-0. 48 
STRONGYLOCOTES COMPLANATUS FIMBRIATUS Clay 
Strongylocotes complanatus fimbriatus CuiAy, Proc. Zool. Soc. London, ser. B, 
1937, p. 156, pl. 4, fig. 8. (Hosts: Crypturellus c. cinnamomeus, Nicaragua ; 
and C. cinnamomeus mexicanus, Mexico.) 
This race is represented by three adult females and four juvenals. 
They were taken on Crypturellus cinnamomeus sallaei, collected by 
the author at Tres Zapotes, Veracruz, Mexico, on March 27, 1940. 
It is of the type of S. ¢. interruptus, agreeing closely in size with 
