THE BLOOD-SUCKING DIPTERA OF PALESTINE. 123 



Dorsum of thorax (in dried specimens) shining mummy-brown ; chitin plates on 

 dorsum of abdomen small {first three plates in $ minute) ; entire dorsum of abdomen 

 of (^ from posterior margin of basal segment backivards inclusive, except greater part 

 of the four plates of chitin and area immediately in front of last plate, thickly clothed 

 with relatively long, recumbent, cinnamon-rufous hair ; corresponding area of dorsum 

 of abdomen of $ clothed for most part with very short hair. 



Head : dorsal surface, including antennae, ochraceous-tawny, vertical triangle 

 (ocelligerous plate) dark brown or dark mummy-brown, nearly semi-circular and 

 extending much further forward than in L. cervi, L., frontal stripe cinnamon-brown, 

 sepia-coloured or light mummy-brown, about half as broad again as long ; each 

 inner orbit at its widest equal to or slightly exceeding extreme breadth of correspond- 

 ing eye ; clypeus generally with a more or less distinct, isolated, pit-like depression 

 in middle line, midway between pit at posterior end of median longitudinal groove 

 and its hind margin, a dark brown horseshoe-shaped mark (more or less complete 

 or widely interrupted in middle line), usually fairly well defined, and with forwardly 

 directed concavity, encircling pit at end of median longitudinal groove, each arm 

 of the horseshoe running along inner edge of corresponding antennary pit, but not 

 reaching front margin of clypeus, a second, narrower, dark brown, curved mark, 

 interrupted in middle line by posterior pit-like depression, behind horseshoe and mid- 

 way between it and posterior margin of clypeus, arms of posterior curved mark not 

 extending so far forward as those of horseshoe, area adjacent to pit at posterior 

 end of median longitudinal groove brownish ; palpi dark brown, short ; hair on 

 ventral surface of anterior border of head brownish at base, glistening ochraceous- 

 ta\vny towards distal extremity. Cephalic chaetotaxy : one bristle close to inner 

 upper angle of each orbit, on a level with posterior ocelli ; two bristles side by side 

 on each inner orbit, in a row extending obliquely forwards and inwards on a level with 

 upper margin of eye ; one bristle (occasionally two bristles) on inner margin of each 

 orbit close to upper boundary of clypeus. Thorax : dorsum clothed with hair and 

 bristles of moderate length, dark brown at base, glistening cinnamon-rufous towards 

 their distal extremities ; middle line of mesonotum bordered on each side with a 

 curved row of bristles, commencing anteriorly a little in advance of hind margin of 

 humeral callus ; humeral calli each with six or seven bristles, postalar calli each with 

 three bristles ; lateral area of mesonotum on each side clothed fairly thickly with 

 bristles, of which those forming a transverse row on upper surface of protuberance 

 in front of base of each wing-stump are stouter and recurved ; scutellum sometimes 

 showing a pit-like depression (perhaps due to post mortem shrinkage) near each 

 lateral angle, sometimes also with a similar depression in middle line ; hind margin 

 of scutellum with six bristles. Each half of mesosternum roughly quadrate in outline 

 when seen from below, considerably larger than corresponding half of metasternum, 

 and closely beset with very short dark brown bristles, those on hind margin, apart 

 from usual long, hair-like bristle in front of socket of middle leg, larger and stouter 

 than elsewhere ; short bristles on metasternum smaller and fewer than those on 

 mesosternum, though in this case also bristles on hind margin are stouter than 

 remainder. Abdomen: dorsum of ^ with basal segment of usual type, followed 

 in middle line by four small, transversely elongate plates of shining dark brown 

 chitin, widely separated by pinkish buff or cinnamon-buff integument ; transverse 

 diameter of last two plates about the same (0-6 mm.), but last plate considerably 

 deeper {i,e., longer when measured from front to rear) than penultimate, the two 

 anterior plates very small, one- third or considerably less than half the size of the 

 penultimate, basal segment, except hind margin, clothed with short, appressed, dark 

 brown hair ; venter cinnamon-buff, with a large horseshoe-shaped, dark neutral 

 grey mark not extending to distal extremity, and entire surface thickly clothed with 

 short hair, similar in colour and character to that on dorsum ; dorsum of abdomen 

 of o with basal segment similar to that of ^, followed in middle line by four plates 

 of chitin widely separated by light ochraceous-buff integument, the terminal plate, 

 (3442) K 



