TYRINI 337 



The species may be tentatively separated as follows : 



First visible tergite shorter than second; 2.33 mm.; known only from 

 Guatemala latipalpis 



First two tergites subequal or first slightly longer than second; not 

 known north of Panama 2 



2. Known only from Panama ; 2.33 mm curtipalpis 



Known only from Brazil 3 



3. Antennomere VI quadrate, as long as wide; not more than 2.6 mm. in 



length 4 



Antennomere VI regularly transverse, distinctly wider than long; 2.8 

 mm planiceps 



4. Antennomere III much longer than wide; antennal tubercles promi- 



nent, deeply separated and obviously constricted at base; 2.3-2.6 



mm inflatipalpus 



Antennomere III slightly longer than wide; antennal tubercles less 

 marked ; 2.5 mm conjunctus 



The species may be listed as follows : 



conjunctus (Reitter). 1882. Petropolis, Rio de Janeiro, Brazil. 



(Hamotus) Genotype. 

 curtipalpis (Sharp). 1887. Bugaba, David, Panama. (Hamotus) 

 inflatipalpus (Reitter). 1888. Blumenau, Brazil. (Hamotus) 

 latipalpis (Sharp). 1887. Zapote, Guatemala. (Hamotus) 

 planiceps Raffray. 1904. Brazil. 



PSELAPHOCOMPSUS (Raffray, 1908) 



This is an aberrant, monotypic Brazilian genus. Although erected in 1908 

 (p. 403), both genus and species were redescribed by Raffray in 1911 (pp. 

 447-449) . 



The maxillary palpi are unique among neotropical tyrines but are strikingly 

 similar to these organs in Pseudophanias of the Indo-Malayan rain forest. The 

 first segment is minute and inconspicuous as usual; second arcuate, very long 

 and slender, becoming gradually wider to the rounded apex; third wider than 

 long, slightly wider at apex than second, truncate at base and apex. Fourth one- 

 third shorter than second, not much wider at base than third, then slightly 

 broadening near base and then gradually narrowing to a long, acuminate apex; 

 this gives a conical outline which is slightly sinuate internally near apex; the 

 internal face bears a very slender, entire, slightly oblique palpal sulcus, with a 

 very long apical palpal cone set within the sulcus. Raffray states that this palpal 

 cone is one-third the segmental length (PI. XX) . 



The infra-ocular spine is very strongly developed as a tubercle from the 

 posterior genal angle to the middle of the eye, and suggests parallelism with 

 some species of Neotyrus, Tyrogatunus, as well as non-neotropical genera as 

 Tmesiphorus. The small size of the maxillary palpi and other features led 



