TYRINI 333 



HAMOTOCELLUS (Raffray, 1911) 



This is a monotypic Brazilian genus with no close allies in the Tyrini. 

 Raffray in erecting the genus places it near Phamisulus, but there is little quali- 

 tative affinity. The maxillary palpi are four-segment€d with the first segment 

 minute; second elongate-sinuate and subcylindrical; third short, triangular; 

 fourth very long, subfusiform with an acuminate apex and the internal face 

 entirely sulcate (PI. XX). 



The head is unique among neotropical tyrines, being wholly devoid of a 

 common antennal tubercle. The front is perfectly truncate and rectilinear, with 

 an antenna distantly articulated at each apico-lateral angle. 



Pronotum with disc moderately gibbous, laterally the contour is concave to 

 give a modified cordate outline ; there is no median ant€basal fovea, and on each 

 side is a sinuation in which lies the lateral fovea ; lateral foveae connected by a 

 transverse antebasal sulcus which is medianly expanded. 



Each elytron is subtriangular, without any striae or foveae. 



The abdomen is very similar to Phamisulus, broad, tapering rapidly, first 

 three tergites however subequal to slightly decreasing in length, but with a 

 strong, high and narrow margin on the first three visible tergites. 



Cinnamon red with short, abundant, rigid, obtuse setae. Length given as 

 four millimeters so that it ranks as one of our large pselaphids. 



hirsutus Raffray. 1911. Sao Paulo, Brazil. Genotype. 



CERCOCEROPSIS (Raffray, 1904) 



At present there are only two species in this genus, occupying a relatively 

 restricted area of the neotropical region — the Matto Grosso swamp of south- 

 western Brazil, southwards into the Paraguay river drainage to Asuncion, Para- 

 guay. 



In general organization the genus is a specialization of the hamotine plan, 

 especially the antennae, head, pronotum, and elytra suggest Hamotus s.s. while 

 the very elongate first visible tergite suggests Apharus as noted by Raffray 

 (1904), this segment being longer than the other four tergites united. The 

 maxillary palpi are well-developed and indicate parallelism or affinity with 

 Cercoceroides. 



The maxillary palpi have the first segment very small as usual in the tribe ; 

 second segment elongate, slender basally and apically gradually inflated to a 

 rounded apex; third segment short, triangular, slightly longer than wide, the 

 apex of this triangle inserting into the second, and the base of the triangle ar- 

 ticulating with the fourth, segment; fourth (distal) segment very elongate, sub- 

 filiform or narrowly subfusiform, subcylindrical, with both base and apex sub- 

 acuminate, and the internal face entirely but narrowly sulcate, with the usual 

 oblique palpal cone set near apex within the sulcus (PI. XX). 



The species may be separated as follows: 



Third palpomere regularly obconical, as long as wide; fourth palpo- 

 mere regularly fusiform, slender; 1.6-1.8 mm.; Brazil longipes 



