COLEOPTERA. BYRRHID. 21 
Subfamily 6.  Pselaphides Westw. (Pselaphide Steph.) 
EUPLECTUS Kirby. Psrtarnus p. Reich. 9sp. Ps. signatus Reich. 
Elongate, narrow, depressed ; last joint of palpi ovate, conic ; ditto of antenne 
large. Denny, pl. 1. 
TRIMIUM dubé. Evurrtecrus p. Denny. 1 sp.  Psel. brevicornis Reich. 
Elongate, subcylindric; last joint of palpi securiform; thorax ovate; last joint 
of antenne very large. Denny, pl. 2. f. 4. 
BYTHINUS Leach. Psetaruus p. Reich. 4sp. Ps. securiger Reich. 
Short, very convex ; last joint of palpi large, securiform ; thorax cordate ; second 
joint of antenne very large. Denny, pl. 3. 
ARCOPAGUS Leach. Psrtaruus p. Reich. 4sp. Ps. bulbifer Reich. Curt. 422. 
Short, very convex ; thorax widest in front ; second joint of antenne moderate. 
TYCHUS Leach. Psetaruus p. Payk. 1 sp. Ps. niger Pk. Denny, pl. 6. 
Body short, convex ; terminal joint of palpi internally greatly dilated, securiform; 
fifth joint of antenne g dilated; thorax not impressed, 
LYRUS* dubé. Bryaxis p. Leach? 1 sp. Psel. mucronatus Pz. Curt. 315. 1—5. 
Tarsi didactyle ; intermediate trochanters spinose ; thorax nearly spherical. 
BRYAXIS Knock. Retcuensacuia Leach. Z. J. 7 sp. Staph. impressus Pz. 
Short, subconyex ; last joint of palpi conical, externally somewhat dilated ; thorax 
cordate, 3-foveated. Curt. 315. 
BATRISUS Aubé. Bryaxis p. Steph. 1 sp. Br. nigriventris Denny. 
Subelongate, subeconvex ; antennz inserted in a lateral fossula; thorax with three 
longitudinal sulci. Denny, pl. 7. f. 1. 
PSELAPHUS Herbst. Anruicus p. Pz. 4sp. Ps. Herbstii Reich. 
Body somewhat elongate; elytra and abdomen depressed ; terminal joint of 
palpi long, clavate. Denny, pl. 9. 
Tribe 2. Chilognathomorpha MacLeay. 
Subtribe 1. Cordylocerata Westw. 
Stirps 1.  Clavicornes Stephens. 
Family 1. BYRRHIDZ Leach. (Byrrhus Linn.) 
BYRRHUS Linn. Cisreta p. Marsh. 10sp. 8. pilula Linn. Curt. 135. 
Ovate-globose, convex, sericeous ; club of antenne 5-jointed, gradually thickened 
to the tip. a 
NOSODENDRON Latr. Byrruus p. Panz. sp. Spher. fasciculare F. 
Hemispheric, ovate ; antennz with the third joint very long; club large, 3-jointed ; 
elytra fasciculated. Curt. 246. 
SYNCALYPTA Dillw. Cuarornora K. 3sp. By. arenaria St. 
Hemispheric, ovate; antenna with third joint small; club 3-jointed; elytra 
rigidly setose. Sturm, D. F. 2. pl. 35, e. 
TRINODES Meg. Anturenus p. Fab. 1sp. Anthr. hirtus Fab. Pz. 11. 16. 
QOvate, subconvex, densely pilose; legs slender; club of antenne 3-jointed. 
ASPIDIPHORUS Zeigl. Nurivuta p. Gyll. 1 sp. N. orbiculatus G. Curt. 450.5 
Suborbiculate ; elytra rounded at tip; antenne 10-jointed; club long, 3-jointed. 

* The type of this genus is the Pselaphus mucronatus of Panzor, which Stephens 
gives as synonymous with Bryaxis sanguineus, and Curtis figures the trochanters of 
this species with spines ; I have therefore introduced Aube’s genus. 
+ Mr. Curtis’s figure giving this insect the habit of a Hister, with posteriorly 
truncate elytra, is incorrect. 
C3 
