CRAWFORD, THYSANOPTERA OF MEXICO AND THE SOUTH 155 



Males much smaller than female, average length .74 mm. ; with smaller 

 depression in front of eyes; legs smaller and weaker. Abdomen (Fig. 63 C) 

 lounded at tip; with a pair of very long stout spines on ninth segment, set on 

 a distinct tubercle, and a similar pair on anal segment ; four small spines at 

 tip of anal segment. 



Described from numerous females and several males. 



Food-plants : Several Composita;, a small native acacia-like tree, a Solaii- 

 imi, and several other plants. 



Locality: Guadalajara, Mexico (altitude 2000-6000 feet), (Crawford). 



This species resembles most closely B- tritici Fitch, but in the characters 

 of the head and antennas and several other details it is markedly difTerent. It 

 is a very common species, found on many flowering plants and trees, and, con- 

 sequently the characters are not constant within the species; the double spine- 

 bearing tubercle on the second antennal segment is, in some of the mounted 

 specimens, less pronounced than in the illustration (Fig. 63 B) ; the depression 

 on the vertex and frons is sometimes smaller in extent, but akvays the anterior 

 ocellus is directed forward, and the large pair of spines is on the margin of the 

 depression. The color and the arrangement of the spines is quite constant ; 

 in some of the mounted specimens there is an abrupt variation in color to dark 

 brown ; as there are several distinct minor characters in these brown specimens, 

 they are described below as a variety of the species. 



Euthrips cephalicus reticulata n. var. 



General color uniform brown. Average length .97 mm. Entire body 

 surface reticulated deeply ; production of second antennal segment present, but 

 not so marked as in the species ; depression of vertex less pronounced, but 

 with anterior ocellus directed forward. Spines arranged as in species ; wings 

 light brown ; legs concolorous with body except fore tibiae and all tarsi light 

 brown ; basal antennal segment and basal two-thirds of II brown ; apical third 

 of II, III, IV, and basal half of V yellow ; the rest light brown. 



Described from two females and three males taken with the species on 

 certain Rosaceae and Labiatae. 



Locality: Guadalajara, Mexico. (Crawford.) 



Dictyothrips reticulata u. sp. 



Length 1.55 mm.; general color light brown; entire body surface, includ- 

 ing legs and basal antennal segments, deeply and finely reticulated. 



Head (Fig. 64 A) slightly broader than long, converging somewhat 

 posteriorly, and broadly rounded anteriorly ; occiput elevated ; cheeks finely 

 serrated, full, not spinose ; vertex lower than occiput, elevated and produced 

 between eyes and bearing the anterior ocellus at its apex ; front broadly bisul- 

 cate, sloping down to insertion of antennae, slightly produced between basal seg- 

 ments ; with six short but conspicuous postocular spines, one behind each 

 posterior ocellus, two behind and one outside of anterior ocellus, and two on 

 the ridge between the sulca. Eyes very large, prominent, slightly bulging, very 

 coarsely faceted and very pilose ; ocelli very large, prominent, oval, between 



