0?i Aquatic Carnivorous Coleoptera or Dytiscidce. 709 



is a little different, owing to the heel being very little prolonged (i.e., 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 3^ m.m. in the 

 transverse direction. In the female the thorax is very dull, and tlie 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, being 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 Isevigatus (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 epipleurpe. T have seen only a single pair and 

 they are rather immature. 



Mexico, (found by Mr. Flohr.) 1126. 



Group 4. 



1110. Cybister puncticollis, Aube, Tragus 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 

 rutis ; pe Jibus posterioribus piceis, femoribus fere nigris, angulo externo tibiisque 

 plaga superior! rufescentibus, calcari superior! simpliciter acuminato ; elytrorum 

 epipleuris sat latis. Long 29, lat. 16 J 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 a very fine punctuation ; on the thorax there is an extremely fine close 



* T 9 



