374 
BICHARD S. BAGNALL 
Habitat: A single example of the brachypterous form taken by 
Mr. C. Chyzer at Bo drog-Szerdahely, August 17th 1892. 
Mr. Karny’s examples were taken on grass at Oberweiden, Austria, 
August 29th 1909. 
6. Acantho thrips bidens n. sp. (Pl. XII. fig. 1—6). 
Length 1*85 mm.; breadth of mesothorax 0*36 mm. 
Colour yellowish brown, all tarsi yellow ; fore-tibiæ yellow, lightly 
shaded with greyish brown ; intermediate and hind tibiæ yellow only 
at knee and tip; antennæ with two basal joints concolorous with head, 
basal half of third and fourth, basal third of fifth and base of sixth, 
yellow, and rest of antennæ greyish-brown. Bed hypodermal pigment 
diffused over the whole of the thorax, more lightly diffused at the 
forepart, sides and base of head, and thickly deposited down each side 
of the abdomen. 
Head about one and one-third as long as broad behind eyes and 
twice as long as the prothorax. Cheeks slightly arcuate, narrowed to 
base and furnished with three or four minute spine-set warts. Eyes 
finely facetted, black ; post-ocular spines fine and set moderately well 
back ; ocelli large, red, set close together with the posterior pair on a 
line drawn through the anterior third of eyes. Mouth-cone pointed, 
reaching almost across the prosternum. Antennæ approximate; second 
joint cylindrical, elongate-cyathiform ; third and fourth broadly clavi- 
form the third being laterally emarginate within ; fifth claviform ; sixth 
and seventh fusiform, constricted at base and truncate at apex; eighth 
pointed to tip. Third joint one and two-fifths as long as second and 
equal to fourth ; fifth, sixth and seventh, seven-eighths of fourth, fifth 
and sixth respectively, and apical joint two-thirds the length of the 
penultimate. A pair of long sense-cones on each of the joints three 
to six. 
Prothorax transverse, twice as long as broad. Bristles at each 
anterior angle exceptionally long ; antero-marginal pair obsolete ; mid¬ 
lateral, postero-marginal and pair at posterior angles moderately long. 
Pterothorax a little broader than long and broader than the width 
across fore-coxæ, sides of metathorax roundly and slightly narrowed to 
base of abdomen. Wings reaching to seventh abdominal segment, median 
vein obsolete, cilia long. Each fore-coxæ armed with one moderately 
long and a pair of shorter prominent spines ; fore-femur two and one- 
half times as long as broad, armed with a pair of short and moderately 
sharp teeth near tip within ; fore-tibia produced to a point at tip 
