THE GENUS KR1SNA (JASSIMJ) 
By C. F. Baker 
Of the College of Agriculture, University of the Philippines, Los Banos 
FIVE PLATES 
The Orient possesses an extensive fauna of large, fine jassoid 
insects related to Selenocephalus. These are all stout-bodied, 
short-headed jassids and commonly with the face, or the vertex, 
or the pronotum, or all three, coarsely sculptured, this sculpturing 
commonly consisting of transverse rugosities or wrinkling, and 
frequently with the clavus and the base of the corium strongly 
punctate or rugose-punctate. The anterior border of the head 
varies from sharp margined to very obtusely rounded between 
the vertex and the face. 
In general, the jassids in question are distinguished by two 
important structural characters. The antennal scrobes are large, 
and not confined to the cheek, but involve a portion of the lateral 
surface of the frons, and are overhung by a thick, sharp, mar- 
gined ledge, which passes on to the frons, the carinate edge 
curving downward on the latter, in some cases nearly to the 
clypeus. The lateral margin of the frons thus passes upward 
through the scrobe and cuts the supra-antennal ledge. Neither 
previous descriptions nor drawings bring out this important 
structural feature, and previous drawings of the face are uni- 
formly incorrect as to this area. The ocelli are on the upper an- 
terior border of the head or near it, near to the eyes, and often 
visible from above. The actual superior frontal border is just 
below the ocelli ; this suture is rarely distinct, though frequently 
rudimentary at the sides. The anterior border of the head may be 
margined by a more or less sharp transverse carina above the 
ocelli, and at the same time may have another similar carina just 
below the ocelli, in which case we say that the ocelli lie in a 
transverse furrow or sulcus. Either one or both of these carinse 
may be absent or there may be several sharp transverse carinte. 
Sometimes the sulcus is very narrow ; at other times, broad with 
a few to many transverse wrinkles within. Sometimes both ca- 
rinse are lacking, and only the transverse band of wrinkles re- 
mains. But the wrinkles or the carina or the sulcus, in some 
form, are always present in the members of this group. The 
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