On Aquatic Carnivorous Coleoptera or Dytiscide. 709 
is a little different, owing to the heel being very little prolonged (i¢., the basal 
fringing hairs diverging but little from the palettes near the articulation with the 
tibia) they are nearly elliptical in form; they attain about 31 m.m. in the 
transverse direction. In the female the thorax is very dull, and the sexual sculp- 
ture is deep and close, and as in the preceding species covers the greater part of 
the elytra. 
Wehncke’s description of the female must have been made from another species, 
as he states the elytra to be free from sexual sculpture. 
South America (Medellin, Columbia ; Steinheil). 1105. 
1109. Megadytes flohri, n. sp,—Ovalis, sat latus et convexus, supra nigricans, 
capite anterius, prothorace anterius elytrorumque lateribus rufescentibus ; subtus 
piceus, pedibus rufis, femoribus posterioribus picescentibus ; antennis gracilioribus. 
Long. 22, lat. 12 m.m. 
The front tarsi of the male are small, beimg 2 m.m. in the transverse direction, 
the basal fringing hairs are rather short and elongate, and at the heel diverge a 
little but not greatly from the palettes. The intermediate tarsi bear elongate 
sexual pubescence on their three basal joints. The female has no trace of any 
sexual sculpture. 
This species has the male tarsi as small as in Dytiscus levigatus (No. 1106) but 
their structure beneath is more like that of M. fraternus (No. 1107): from both 
these allies it departs by the rufescent outer margin of the wing-cases; this red 
colour extends to and includes the epipleuree. I have seen only a single pair and 
they are rather immature. 
Mexico, (found by Mr. Flohr.) 1126. 
Group 4. 
1110. Cybister puncticollis, Aubé, Trogus puncticollis, M.C.—Ovalis, parum latus, 
nigricans, nitidus, capite anterius prothoraceque ad latera testaceis, elytris vitta 
intramarginali versus apicem parum arguta testacea ; pedibus quatuor anterioribus 
rulis; pedibus posterioribus piceis, femoribus fere nigris, angulo externo tibiisque 
plaga superiori rufescentibus, calcari superiori simpliciter acuminato ; elytrorum 
epipleuris sat latis. Long 29, lat. 16} m.m. 
I have not seen the male of this species ; the female seems at first sight to be desti- 
tute of sexual sculpture, but on careful examination there is seen on the basal 
portion of the elytra a rudimentary sculpture of short irregular scratches, mixed 
with avery fine punctuation; on the thorax there is an extremely fine close 
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