1891.] 245 



"The antennsc (fig. 2tl) in both kinds do not appreciably differ, but the logs 

 are discordant, as in the comparative statement. 



L. HESPEBIDUM (fig. 1). L. LATTRI (fig. 2). 



Coxa without hairs. Coxa with two long hairs. 



Trochanter with one very long hair. Trochanter with one short hair. 



Femur, tibia and tarsus without hairs. Femur without hairs ; tibia with one 



long hair ; tarsus with two very fine 

 short hairs near base of claw. 



Tarsal digitules very long, stout at base, Tarsal digitiilcs short and stout, scarcely 

 dilated at apex, extending beyond di- or not extending beyond dilated digi- 



lated digitules of claw. tules of claw, which are a trifle longer 



than in L. hesperidum. 



Three specimens examined. Fourteen specimens examined. 



" In each kind the characters stated were constant in all the examples." 

 Some mature scales, on ivy leaves {Hedera helix), previously re- 

 ceived from Mr. E. Parfitt, of Exeter, proved to be L. lauri, all 

 agreeing perfectly with the foregoing description. 



Taking all the differential structural characters into consideration, 

 I think there are good grounds for maintaining a specific distinction, 

 and I apprehend that hitherto two similar species have often been 

 regarded as one. L. hesperidum has not been recorded as found 

 living on plants growing in the open air in England.* 



Okthezia occidentalis, n. sp. 



? adult (Fig. 3). Short-oval, piceous, covered with white cereous matter, 

 forming above the head an obtuse, gibbous, projection, and thence, on the margin all 

 round, as a raised border, a series of broad, upward-curving, laterally-joined lamella), 

 slightly longer posteriorly, meeting there in a broader, channelled, projecting plate ; 

 marsupium (in this example) only incipient. On the uneven dorsal surface (within 

 the marginal border), lying in a depression in the middle of each of the three thoracic 

 segments, a scutelloid, obtusely pointed, concave, wedge-shaped plate extends back- 

 wards on to the next segment, interrupting, as it were, the lamellee which extend 

 from side to side ; their lower edge is not straight, but next to the cuneate plate on 

 each side of it is curved up to it, and its raised surface there is hollowed out or 

 flattened. On the other segments the lamellas are of similar form but shorter 

 (narrower), and are interrupted in the middle by a continuous longitudinal, angular 

 furrow, of which the sides are raised into obtuse points on each segment. Legs, and 

 antennae of 8 joints (Fig. 3a), piceous. Length (without marsupium), 4 mm. 



(? larva (or what I deem to bo such) like the adult ? , except in size, but the 

 three thoracic cuneiform plates and the points on the edges of the abdominal furrow 

 are all more sliarply defined, and the terminal projecting lamella of the circum- 

 ferential series is conical. Length, 2"5 mm. 



Male imago not seen. 



* On July Ist, 1891, Mr. S. Stevens sent from his conservatory some leaves of Nerium oleander 

 crowded on the under-side along the mid-rib with scsiles of i. lauri in all stages of growth. 

 Examination showed the autonnaK and IcgH to be idciiticil with tlie figures quoted aliovc, excoiit 

 that in the adults, in some cases, the 3rd and 4th joints of the antenna; are equal in length. 



