122 
PROCEEDINGS OF SOCIETIES. 
*1. excavatum , Er. ; Gilm. ; Redt.— trisulcatum, Steph.—foveolatum, Alib.-— 
gallicum , limbatum, Mots. 
2. angustatum , Er.; Fn.Fr.— oblongum , Gilm. ; Redt.— rugulosum , Alib.— 
Rare. 
3. coarctatum, n. sp.— Lineare , subdepressum , capite thoraceque nigris scabri- 
culis , elytris fuscis , antennis pedibusque flavis , prothorace transverso postice 
attenuate intra basim transversim obsolete impresso. Long. ^ lin. 
Elongate linear, rather depressed. Head and thorax black, pubescent, the hairs 
seeming to spring from distinct granular dots. Head triangular with small eyes, 
as broad as the prothorax ; mouth prominent; palpi and antennse light yellow, the 
last joint of these globose-ovate, the first two joints ferruginous. Frothorax 
broader than long; truncated in front, the sides rounded, strongly attenuated 
behind, with the basal angles rounded off, faintly impressed within the hind margin. 
Elytra nearly linear, covering the abdomen, obtusely rounded in common at the 
tip ; scarcely broader than the greatest breadth of prothorax, and singly more than 
three times so long as broad; intricately stippled and pubescent (as well as the 
scutellum), and hence rather opaque; blackish-brown, with the tip paler. Legs 
ferruginous, femora rather darker. 
Narrower and not longer than Trick, curta. The very brief character given of 
Tr. pulchella , Alibert, contains nothing to distinguish it from our insect, but its 
size is considerably greater; and the pulchellum of Gillmeister and Faune Fran - 
9 aise is described as having two separate impressions at the base of prothorax, not 
observable in ours. Whether it be apterous, as stated of Alibert’s insect, is 
uncertain. 
Rare; in a farm-yard at Holywood. 
4. clandestinum , n. sp .—Sublitieare depressum subtiliter pubescensfusco-testaceum , 
antennis pedibusque pallide flavis , prothorace obcordato basi media foveolato. 
Long, i lin. 
Probably the smallest known Coleopterous insect, being smaller, but especially 
narrower, than Pt. excavatum. Nearly linear, depressed, finely pubescent, dusky 
testaceous. Head triangular, as broad as prothorax. Eyes black, coarsely granu¬ 
lated. Antennse pale yellow, stout, the intermediate joints paler ; those immediately 
preceding the club oblate; the 2nd, 9th, and 10th globose, the 10th twice as large 
as 9th ; the 11th ovate, rather acute. Frothorax with the sides somewhat rounded 
before the middle, narrowed behind, with the basal angles a little obtuse, an oblong 
impression, or abbreviated channel, in the middle of the base. Elytra two and a- 
half times as long as prothorax, one-third broader than the base of it, and nearly 
of uniform breadth for two-thirds of their length, thenceforth rounded-attenuate, 
covering the abdomen. Wings perfect, fringed with blackish hairs. Legs pale 
yellow. 
Taken at Holywood. Also in England, J. Curtis. Seems to be very rare, but 
from its extreme minuteness and pale colour may easily escape observation. 
Compare the description of Ptilium vittatum , Mots., found in ants’ nests at 
Charkow. 
5. kunzei , Heer; Er.; Gilm.; Redt.; Fn.Fr.; Mots .—longicorne, Waltl.— 
spinipenne , Comolli.— titan , Newman (?)—Not rare about farm-yards. 
Gen. 4. Trichopteryx, Er.; Redt ; Fn.Fr.—p., Kirby; Heer; Gilm.; 
Alib.— Ptilium, Mots.—p., Waltl.— Acrotrichis , Mots. ; Woll. 
1. curta , Alib.; Gilm.— abbreviatella , (Heer?); Er. ; Fn.Fr.— nana, Steph.— 
minuta p., Steph.—Not rare about farm-yards. 
2. sericans, Heer ; Er. ; Fn.Fr.; Mots.— depressa , Gilm.; Redt.— volans , 
bovina , brevis , Mots.—Not rare, with the last. 
*3. pumila , Er. ; Fn.Fr.; sericans , Gilm.; Redt_ pusilla , Steph. (?) 
4. pygmcea, Er. ; Fn.Fr.— parallelogramma, Gilm.; Redt.— chevrolatii , Alib. 
—minuta p., Steph.—Rare. 
