112 POMONA JOURNAL OF ENTOMOLOGY 



with broad tip — 1\' with convex surface to receive base of \' ; \' notched at 

 tip to receive base of \'I : \'I to X all free, with small sense areas; antennal 

 spines not very large. 



Prothorax (Fig. 50 A) a little longer and wider than head ; angles rounded ; 

 one spine on anterior angles, and one very inconspicuous spine on posterior 

 angles ; a few small spines on dorsal surface ; reticulated. Mesothorax largest, 

 with a triangular area on dorsal surface near the front more conspicuously 

 reticulated than the rest. Legs (Fig. 50 E. F, G) medium; tibiae with mod- 

 erately .stout spines at tip ; anterior tibiae light on distal half, the rest dark ; 

 fore-tarsi with small tooth at tip : middle and posterior tibiae dark ; femora 

 reticulated. Wings ( Fig. 50 H ) fully developed, broad at base, the rest 

 narrow ; with two longitudinal veins extending the entire length, set with short 

 spines, twenty on anterior vein and sixteen on posterior ; simple fringe on 

 both margins, and a row of short spines on anterior margin posterior fringe 

 longer ; wings light brown, except basal one-sixth clear ; scale small. 



Abdomen (Fig. 50 B) uniform dark brown, usually very stout, occas- 

 ionally slender ; with two spines on dorsal surface in center of each segment, 

 and a few small spines on margin ; spines at tip of abdomen short ; comb-like 

 arrangement of spines on posterior margin of segments one to nine ; surface 

 reticulated. 



M.\LE : Much smaller than female, but similar in every respect e.xcept 

 tip of abdomen ; with two claspers on posterior margin of anal segment ( Fig. 

 50 C). 



Measurements of female: Head, length .13 mm., width .19 mm.; pro- 

 thorax, length .145 mm., width .26 mm.; pterothorax, width .2^ mm.; abdo- 

 men, length .61 mm., width .28 mm.; total length 1.18 mm. .\ntennae : I .020, 

 II .032, ni .021, IV .058, V .044, VI .025, MI .028, \'III .017, IX .016, X .020; 

 total length .28 mm. 



Described from twenty-si.x females and ten males. 



Food plant : A low native tree, with small yellow flowers, common in 

 the barrancas near Guadalajara: also a shrub belonging to the family MaJ- 

 pighiaccae. 



Locality: Guadalajara, Mexico. (Crawford.) 



There is no doubt as to the antennae being 10-segmented. for in some of 

 the mounted specimens used in this study, the .'Segments are completely sepa- 

 rated at every true joint. The last five segments are smaller and free, as de- 

 scribed in some Acolothripidae. There is no differentiation of the style, which 

 is present in most Thripidac. In one deformed specimen the left antenna 

 is eight-segmented (Fig. 50 I), the right possessing the ten normal segments. 

 This is evidently a reversion to the normal type of Thripidae, the three basal 

 segments being similar to the normal, l)ut the fourth is shortened and has 

 apparently two pseudo-joints instead of one in the normal, the fifth being 

 somewhat similar to the normal except that it is not notched at the distal end, 

 but is convex like the normal fourth ; the last five segments of the normal 

 antenna are represented in this case by three relatively longer segments ; the 

 arrangement of the antennal spines is similar in the two cases. 



