INSECUTOR INSCITI^ MENSTRUUS 31 



Antennal segments 12345678 



Length (n) 35 46 46 53 52 47 41 27 



Width (^i) 28 29 26 29 26 23 20 12 



Total length of antenna, 0.347 mm. 



Nymph (in last instar.). — Bright orange to reddish orange, 

 with head, pronotum, legs, antennse, abdominal segments 9 

 and 10, and the region of the spiracles on segment 8, nearly 

 black ; the hypodermal pigment becomes red in at least the 

 last three abdominal segments and often also in the head and 

 thorax. 



Described from several adults of both sexes and 22 nymphs, 

 taken at Bomitiful, Utah, August 5 and 6, 1914, by Mr. Alex 

 Wetmore, where they were abundant on the fruiting heads 

 of a sedge, Scirpus paludosus A. Nelson, growing in the alka- 

 line marshes at the mouth of the Jordan River. 



The form of the third and seventh antennal segments should 

 serve to distinguish this from the closely related Haplothrips 

 jonesii Karny. 



Liothrips tessariae, new species. 



Female (macropterous). — Length about 3.3 mm. Color dark 

 blackish brown or black, with segments 3-5 of antennae largely 

 yellow; wings clear, the fore pair with a slight brown cloud 

 in the region of the three basal spines. 



Head about 1.75 times as long as wide, sides nearly parallel, 

 slightly flaring just behind eyes, and a little concave to basal 

 fourth, then roundly narrowing to base; vertex slightly pro- 

 duced, the anterior ocellus borne at its tip and overhanging, 

 but not attaining frontal costa; dorsal and lateral surfaces 

 closely transversely striate and with a few minute spines ; 

 postocular bristles one and one-half times the length of eyes, 

 situated far back of them, about midway between front and 

 hind margins of head; no other prominent cephalic bristles. 

 Eyes not prominent nor enlarged, one-third as long as head and 

 about as wide as their interval, inner margins gently rounded, 

 not prolonged on ventral surface of head. Ocelli of posterior 

 pair situated in front of middle of eyes. Antennae slender, 

 nearly 1.8 times as long as head, inserted on front of head and 



